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    <lastmod>2026-10-13</lastmod>
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      <video:description><![CDATA[Кривая Вивиани является прообразом параболы при ортогональной проекции, гиперболы и лемнискаты Бернулли при центральных проекциях.]]></video:description>
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      <video:description><![CDATA[Кратчайший путь на глобусе между двумя городами реализуется дугой большой окружности. Показаны самые длинные «прямые» морской и сухопутный пути на Земле]]></video:description>
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    <lastmod>2022-05-31</lastmod>
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      <image:title><![CDATA[Roberval balance]]></image:title>
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    <lastmod>2020-04-13</lastmod>
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    <lastmod>2020-03-29</lastmod>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/12@hd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/12.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/13@hd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/13.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/14@hd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/14.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/15@hd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/15.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/16@hd.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/snell/16.jpg</image:loc>
      <image:title><![CDATA[Snell’s Law]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_snell@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/snell/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Snell’s Law]]></video:title>
      <video:description><![CDATA[Which pot seems to be deeper - an empty one or filled with water? How does optical fibre work? The mathematics behind these questions is Snell’s law and the properties of sine.]]></video:description>
      <video:duration>139</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/kaleidoscope/</loc>
    <lastmod>2019-03-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/01@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/01.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/02@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/02.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/03@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/03.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/04@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/04.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/05@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/05.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/06@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/06.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/07@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/07.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/08@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/08.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/09@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/09.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/10@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/10.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/11@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/11.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/12@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/12.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/13@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/13.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/14@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/14.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/15@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/15.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/16@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/16.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/17@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/17.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/18@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/18.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_kaleidoscope@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/kaleidoscope/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Kaleidoscope]]></video:title>
      <video:description><![CDATA[The Kaleidoscope, a well-known toy from childhood, turns out to be entirely determined by mathematics.]]></video:description>
      <video:duration>469</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/helix/</loc>
    <lastmod>2017-12-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/01@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/01.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/02@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/02.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/03@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/03.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/04@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/04.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/05@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/05.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/06@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/06.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_helix@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/helix/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Helix]]></video:title>
      <video:description><![CDATA[Why can a nut be screwed onto a thread? The reason is that the helix — the base of threaded joints — is uniform at all points.]]></video:description>
      <video:duration>96</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/rainbow/</loc>
    <lastmod>2017-06-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/01@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/01.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/02@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/02.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/03@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/03.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/04@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/04.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/05@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/05.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/06@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/06.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/07@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/07.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/08@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/08.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/09@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/09.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/10@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/10.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/11@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/11.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/12@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/12.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/13@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/13.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/14@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/14.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/15@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/15.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/16@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/16.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/17@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/17.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/18@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/18.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/19@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/19.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/20@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/20@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/20.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/21@fhd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/21@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/21.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_rainbow@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/rainbow/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Rainbow]]></video:title>
      <video:description><![CDATA[The rainbow is such a remarkable phenomenon of nature, and its cause has been so meticulously sought after by inquiring minds... (Rene Descartes)]]></video:description>
      <video:duration>200</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/archimedes/</loc>
    <lastmod>2017-03-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/01@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/01.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/02@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/02.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/03@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/03.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/04@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/04.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/05@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/05.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/06@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/06.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/07@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/07.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/08@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/08.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/09@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/09.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/10@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/10.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/11@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/11.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/12@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/12.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Archimedes@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/archimedes/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sphere volume: Archimedes Scales]]></video:title>
      <video:description><![CDATA[The cylinder, which has as its base the largest circle of the sphere, and a height equal to its cross-section, is one and a half of the sphere; and its surface is one and a half of the surface of the sphere.]]></video:description>
      <video:duration>161</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/geometric-progression-gears/</loc>
    <lastmod>2017-02-07</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/01@hd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/01.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/02@hd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/02.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/03@hd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/03.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/04@hd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/04.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/05@hd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/05.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_geometric-progression-gears@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Geometric progression decrease]]></video:title>
      <video:description><![CDATA[A visual demonstration of a geometric progression decrease.]]></video:description>
      <video:duration>156</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/platonic-solids-harmony/</loc>
    <lastmod>2013-10-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/01@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/01.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/02@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/02.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/03@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/03.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/04@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/04.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/05@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/05.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/06@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/06.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/07@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/07.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/08@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/08.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/09@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/09.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/10@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/10.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/11@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/11.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/12@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/12.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/13@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/13.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/14@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/14.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/15@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/15.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_platonic-solids-harmony@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Regular polyhedra harmony]]></video:title>
      <video:description><![CDATA[Regular polyhedrons have been the subject of interest for many great scientists. Perhaps it was the beauty and harmony of the regular polyhedrons that made scientists of the past suggest some kind of deeper purpose for them than just geometric objects.]]></video:description>
      <video:duration>244</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/shukhov-tower/</loc>
    <lastmod>2012-03-14</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/01@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/01.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/02@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/02.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/03@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/03.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/04@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/04.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/05@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/05.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/06@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/06.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/07@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/07.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/08@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/08.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/09@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/09.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/10@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/10.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/11@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/11.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/12@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/12.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/13@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/13.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/14@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/14.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/15@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/15.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/16@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/16.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/17@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/17.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/18@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/18.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/19@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/19.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/20@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/20@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/20.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/21@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/21@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/21.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/22@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/22@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/22.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/23@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/23@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/23.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/24@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/24@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/24.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/25@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/25@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/25.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/26@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/26@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/26.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/27@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/27@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/27.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/28@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/28@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/28.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/29@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/29@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/29.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/30@fhd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/30@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/30.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Shukhov-tower@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/shukhov-tower/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Shukhov Tower]]></video:title>
      <video:description><![CDATA[Historical reconstruction of the construction of V.G. Shukhov's tower on Shabolovka in 1919-1922]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/train-wheelset/</loc>
    <lastmod>2011-10-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/01@fhd.jpg</image:loc>
      <image:title><![CDATA[A tunnel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/01@hd.jpg</image:loc>
      <image:title><![CDATA[A tunnel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/01.jpg</image:loc>
      <image:title><![CDATA[A tunnel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/02@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/02.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/03@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/03.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/04@fhd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/04@hd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/04.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/05@fhd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/05@hd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/05.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/06@fhd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/06@hd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/06.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/07@fhd.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/07@hd.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/07.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/08@fhd.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/08@hd.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/08.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/09@fhd.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/09@hd.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/09.jpg</image:loc>
      <image:title><![CDATA[The passage in a bend]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/10@fhd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels: GOST]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/10@hd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels: GOST]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/10.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels: GOST]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/11@fhd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels: GOST]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/11@hd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels: GOST]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/11.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels: GOST]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/12@fhd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/12@hd.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/12.jpg</image:loc>
      <image:title><![CDATA[A pair of wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/13@hd.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/13.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/14@hd.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/14.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Train wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/15@hd.jpg</image:loc>
      <image:title><![CDATA[Train wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/15.jpg</image:loc>
      <image:title><![CDATA[Train wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/16@hd.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/16.jpg</image:loc>
      <image:title><![CDATA[Cart]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_train-wheelset@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/train-wheelset/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Train wheels]]></video:title>
      <video:description><![CDATA[Do two train wheels cover the same ride, when spin with the same angular velocity? We will discover that the answer is no! For example, this happens for the wheels of a train wagon in a bend.]]></video:description>
      <video:duration>257</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/invisible-body/</loc>
    <lastmod>2010-12-21</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/01@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/01.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/02@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/02.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/03@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/03.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/04@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/04.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/05@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/05.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/06@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/06.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/07@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/07.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/08@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/08.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/09@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/09.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/10@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/10.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/11@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/11.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/12@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/12.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/13@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/13.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/14@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/14.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/15@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/15.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/16@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/16.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/17@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/17.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/18@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/18.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/19@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/19.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/20@fhd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/20@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/20.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_invisible-body@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/invisible-body/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Invisible body]]></video:title>
      <video:description><![CDATA[Do invisible bodies exist? That they exist was discovered in 2009 by some mathematicians.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/windscreen-wiper/</loc>
    <lastmod>2010-11-15</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/01@hd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/01.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/02@hd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/02.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/03@hd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/03.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_windscreen-wiper@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Hinge mechanisms]]></video:title>
      <video:description><![CDATA[Everyone has seen how the car windscreen wipers sweep the water away quickly. If you show the mechanism of this system to a mechanic he will tell you that it cannot work!]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/napkin-folding-problem/</loc>
    <lastmod>2010-11-11</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/01@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/01.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/02@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/02.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/03@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/03.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/04@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/04.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/05@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/05.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/06@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/06.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/07@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/07.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/08@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/08.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/09@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/09.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/10@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/10.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/11@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/11.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/12@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/12.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/13@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/13.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/14@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/14.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/15@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/15.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/16@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/16.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/17@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/17.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/18@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/18.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/19@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/19.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_napkin-folding-problem@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Folded rouble]]></video:title>
      <video:description><![CDATA[How to fold a rectangular sheet of paper (banknote) so that the perimeter of the resulting polygon is more than the perimeter of the source one?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/ham-sandwich-theorem/</loc>
    <lastmod>2010-09-03</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/01@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/01.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/02@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/02.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/03@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/03.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/04@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/04.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/05@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/05.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/06@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/06.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/07@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/07.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/08@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/08.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/09@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/09.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/10@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/10.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/11@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/11.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/12@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/12.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/13@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/13.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/14@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/14.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/15@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/15.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/16@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/16.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_ham-sandwich-theorem@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sandwich problem]]></video:title>
      <video:description><![CDATA[Can you cut by a planar section a sandwich consisting of a slice of bread, a slice of cheese and a slice of ham in such a way that both sides contain the same amounts of bread, cheese and ham?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/continuity/</loc>
    <lastmod>2010-09-01</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/01@hd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/01.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/02@hd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/02.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/03@hd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/03.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_continuity@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/continuity/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Continuity]]></video:title>
      <video:description><![CDATA[Our observation of the world, based since our infancy on the concept of continuity, appears to be a powerful tool used in the proofs of some mathematical propositions.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/vernier/</loc>
    <lastmod>2010-02-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/01@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/01.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/02@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/02.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/03@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/03.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/04@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/04.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/05@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/05.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/06@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/06.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/07@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/07.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/08@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/08.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_vernier@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/vernier/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Vernier scale]]></video:title>
      <video:description><![CDATA[We will show how an additional scale can increase the precision of the measurements.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/pick-theorem/</loc>
    <lastmod>2010-01-25</lastmod>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/tchebyshev-wheelchair/</loc>
    <lastmod>2009-12-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/01@hd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/01.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/02@hd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/02.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/03@hd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/03.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/04@hd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/04.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/TchebRu_wheelchair@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Wheelchair]]></video:title>
      <video:description><![CDATA[Самокатное кресло.]]></video:description>
      <video:duration>0</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/pythagorean-theorem/</loc>
    <lastmod>2009-12-25</lastmod>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/wheel-inventing/</loc>
    <lastmod>2009-10-09</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/01@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/01.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/02@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/02.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/03@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/03.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/04@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/04.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/05@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/05.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/06@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/06.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/07@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/07.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/08@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/08.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/09@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/09.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/wheel-inventing/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Inventing the wheel]]></video:title>
      <video:description><![CDATA[Can a carriage with non-circular wheels ride along the even surface without jolting?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/catenary/</loc>
    <lastmod>2009-05-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/01@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/01.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/02@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/02.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/03@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/03.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/04@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/04.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/05@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/05.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/06@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/06.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/07@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/07.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/08@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/08.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/09@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/09.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/10@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/10.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/11@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/11.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <video:video>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/catenary/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Catenary]]></video:title>
      <video:description><![CDATA[Are you able to move over not round wheels?]]></video:description>
      <video:duration>88</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/steering-geometry/</loc>
    <lastmod>2009-03-26</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/01@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/01.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/02@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/02.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/03@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/03.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/04@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/04.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/05@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/05.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/06@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/06.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/07@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/07.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/08@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/08.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/09@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/09.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/10@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/10.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/11@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/11.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/12@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/12.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/13@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/13.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/14@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/14.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/15@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/15.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/16@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/16.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/17@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/17.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/18@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/18.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/19@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/19.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/20@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/20@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/20.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/21@fhd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/21@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/21.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_steering-geometry@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/steering-geometry/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Steering geometry]]></video:title>
      <video:description><![CDATA[Are the car front wheels parallel when steering?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/flexible-polyhedra/</loc>
    <lastmod>2009-03-23</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/02.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/03@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/04.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/05@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/05.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/06@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/06.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/07@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/07.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/09@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/09.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/10@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/10.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/11@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/11.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/12@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/12.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/13@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/13.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/14@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/14.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/15@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/15.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/16@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/16.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/17@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/17.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/18@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/18.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/19@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/19.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/20@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/20@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/20.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/21@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/21@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/21.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/22@fhd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/22@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/22.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Flexible polyhedra]]></video:title>
      <video:description><![CDATA[Are there closed flexible polyhedra?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/monge-theorem/</loc>
    <lastmod>2009-03-23</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/01@hd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/01.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/02@hd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/02.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/03@hd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/03.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Monge-theorem@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/monge-theorem/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Leaving the plane]]></video:title>
      <video:description><![CDATA[Considering the ambient space we can often learn more about some object.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/ball-volume/</loc>
    <lastmod>2008-11-27</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/01@hd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/01.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/02@hd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/02.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/03@hd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/03.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
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      <image:title><![CDATA[Ball volume]]></image:title>
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      <image:title><![CDATA[Ball volume]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/04.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Ball volume]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/05@hd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
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      <image:title><![CDATA[Ball volume]]></image:title>
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      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/07@hd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/07.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
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      <video:title><![CDATA[Ball volume]]></video:title>
      <video:description><![CDATA[When you buy an orange with a thick peel, you pay generally for the rind.]]></video:description>
      <video:duration>377</video:duration>
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      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Shadows]]></image:title>
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      <image:title><![CDATA[Shadows]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/etudes/shadows/04@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/04.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/05@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/05.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/06@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/06.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/07@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/07.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/08@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/08.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/09@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/09.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/shadows/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Shadows]]></video:title>
      <video:description><![CDATA[Let three orthogonal projections of a body are squares. Does the body have to be a cube?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/axioms/</loc>
    <lastmod>2008-09-18</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/01@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/01.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/02@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/02.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/03@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/03.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/04@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/04.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/05@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/06@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/06.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
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      <video:title><![CDATA[Axioms]]></video:title>
      <video:description><![CDATA[Which stool is more steady on the uneven floor — with four or three legs?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
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  <url>
    <loc>https://en.etudes.ru/etudes/tchebyshev-sorting-mechanism/</loc>
    <lastmod>2008-06-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Sorting mechanism]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/02.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/03@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/03.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/04@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/04.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/05@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/05.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/06@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/06.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/07@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/07.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/08@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/08.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/09@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/09.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/10@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/10.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
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      <video:content_loc>https://en.etudes.ru/.data/video/TchebRu_sorting-mechanism@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sorting mechanism]]></video:title>
      <video:description><![CDATA[Для решения важной практической задачи — сортировки зерна, величайший российский математик Пафнутий Львович Чебышев придумал красивую геометрическую идею и на её основе создал изящный механизм.]]></video:description>
      <video:duration>0</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/translation-rotation/</loc>
    <lastmod>2008-06-02</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/01@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/01.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/02@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/02.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/03@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/03.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/04@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/04.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/05@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/05.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/06@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/06.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/07@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/07.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/08@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/08.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/09@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/09.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/10@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/10.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/11@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/11.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/12@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/12.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_translation-rotation@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/translation-rotation/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Translation and rotation]]></video:title>
      <video:description><![CDATA[Lift the sheet and leave it fall randomly on the table without turning round. To match initial and final positions one almost surely just need to rotate the sheet around some point to some angle!]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/underground/</loc>
    <lastmod>2008-05-21</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/01@fhd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/01@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/01.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/02@fhd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/02@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/02.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/03@fhd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/03@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/03.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/04@fhd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/04@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/04.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/05@fhd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/05@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/05.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/06@fhd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/06@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/06.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_underground@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/underground/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[How deep is the underground station]]></video:title>
      <video:description><![CDATA[The escalator of the metropolitan railway... How many things are hidden behind these words for a curious observer. How to estimate the depth of a subway station, which is accessed via an escalator? It happens that even to answer this question the knowledge of mathematics can be very useful!]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/angle-trisection/</loc>
    <lastmod>2008-03-01</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/01@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/01.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/02@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/02.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/03@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/03.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/04@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/04.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/05@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/05.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/06@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/06.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/07@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/07.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/08@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/08.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/09@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/09.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_angle-trisection@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/angle-trisection/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Angle trisection]]></video:title>
      <video:description><![CDATA[The problem of the division of an arbitrary angle into three equal angles using only compass and straightedge was proved impossible. But there exists a plane linkage that solve this problem.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/degrees-of-freedom/</loc>
    <lastmod>2008-02-21</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/01@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/01.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/02@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/02.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/03@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/03.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/04@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/04.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/05@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/05.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/06@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/06.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_degrees-of-freedom@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Degrees of freedom]]></video:title>
      <video:description><![CDATA[Does every mechanism has a number of degrees of freedom «fixed»? Or there are mechanisms whose number of degrees of freedom is variable? It turns out that there are…]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/lipkin-inversor/</loc>
    <lastmod>2008-01-11</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/01@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/01.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/02@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/02.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/03@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/03.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/04@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/04.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/05@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/05.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/06@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/06.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/07@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/07.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/08@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/08.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Lipkin-inversor@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Lipkin linkage]]></video:title>
      <video:description><![CDATA[Since James Watt invented the steam engine there was a problem of transforming rotary motion of one hinge into the perfect straight-line motion of another. This problem was unsolved for long time. And only beautiful mathematics helped finally to solve it.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/vintage-computers/</loc>
    <lastmod>2007-12-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/01@hd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/01.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/02@hd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/02.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/04@hd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/04.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/07@hd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/07.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_vintage-computers.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/vintage-computers/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Computer engineering in the 1950s]]></video:title>
      <video:description><![CDATA[Machine that immediately does four arithmetical rules itself… Tabulator that prints itself the results of computations…]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/tchebyshev-plantigrade-machine/</loc>
    <lastmod>2007-12-04</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/01@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/01.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/02@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/02.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/03@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/03.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/04@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/04.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/05@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/05.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/06@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/06.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/07@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/07.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/08@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/08.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/09@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/09.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/10@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/10.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/TchebRu_plantigrade-machine@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Plantigrade machine]]></video:title>
      <video:description><![CDATA[You think walking cars are a thing of the distant future, from the time of Lucas's Star Wars? Wrong! The world's first such machine was invented in the second half of the 19th century by Russian mathematician P. L. Tchebyshev.]]></video:description>
      <video:duration>175</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/durer-conjecture/</loc>
    <lastmod>2007-06-19</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/01@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/01.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/02@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/02.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/03@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/03.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/04@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/04.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/05@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/05.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/06@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/06.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/07@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/07.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/08@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/08.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/09@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/09.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/10@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/10.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/11@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/11.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Durer-conjecture@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/durer-conjecture/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Anti-Durer]]></video:title>
      <video:description><![CDATA[Unsolved problem: Is there exists a convex polyhedron that has only self-intersecting connected nets.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/ray-screening/</loc>
    <lastmod>2007-06-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/01@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/01.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/02@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/02.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/03@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/03.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/04@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/04.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/05@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/05.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/06@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/06.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_ray-screening@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/ray-screening/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Screen a ray]]></video:title>
      <video:description><![CDATA[Can we close the propagating in the plane rays with round mirror columns?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/jacobi-polynomials/</loc>
    <lastmod>2007-06-12</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/01@hd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/01.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/02@hd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/02.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/03@hd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/03.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/04@hd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/04.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Jacobi-polynomials@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Nice construction]]></video:title>
      <video:description><![CDATA[Consider several electric charges inside a segment. How will they be arranged to minimize potential energy of the system? It turns out that the charges stopped exactly in the zeros of the Jacobi polynomial.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/corner-reflector/</loc>
    <lastmod>2007-05-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Cat’s eye]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/01@hd.jpg</image:loc>
      <image:title><![CDATA[Cat’s eye]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/01.jpg</image:loc>
      <image:title><![CDATA[Cat’s eye]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Mirrors]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/02@hd.jpg</image:loc>
      <image:title><![CDATA[Mirrors]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/02.jpg</image:loc>
      <image:title><![CDATA[Mirrors]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Mirrors]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/03@hd.jpg</image:loc>
      <image:title><![CDATA[Mirrors]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/03.jpg</image:loc>
      <image:title><![CDATA[Mirrors]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/04@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/04.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/05@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/05.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/06@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/06.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/07@hd.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/07.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/08@hd.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/08.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/09@hd.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/09.jpg</image:loc>
      <image:title><![CDATA[Lunohod]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_corner-reflector@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/corner-reflector/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Corner reflector]]></video:title>
      <video:description><![CDATA[Do bicycle and Lunokhod have something in common? Why do the cat’s eye could be only seen by someone who lighten it?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/drilling-square-holes/</loc>
    <lastmod>2007-02-05</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/01@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/01.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/02@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/02.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/03@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/03.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/04@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/04.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/05@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/05.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/06@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/06.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/07@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/07.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/08@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/08.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/09@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/09.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/10@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/10.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/11@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/11.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/12@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/12.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_drilling-square-holes@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Drilling square holes]]></video:title>
      <video:description><![CDATA[How to perforate a square hole? You just need a special drill.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/polyhedra-development/</loc>
    <lastmod>2006-12-09</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/01@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/01@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/01.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/02@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/02@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/02.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/03@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/03@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/03.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/04@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/04@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/04.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/05@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/05@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/05.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/06@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/06@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/06.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/07@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/07@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/07.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/08@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/08@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/08.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/09@fhd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/09@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/09.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_polyhedra-development@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/polyhedra-development/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[And this is a net?!]]></video:title>
      <video:description><![CDATA[There is a whole variety of nets for the most usual polyhedra.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/cycloid/</loc>
    <lastmod>2006-11-21</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/01@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/01.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/02@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/02.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/03@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/03.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/04@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/04.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/05@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/05.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/06@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/06.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/07@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/07.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/08@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/08.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/09@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/09.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/10@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/10.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/11@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/11.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/12@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/12.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/13@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/13.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/14@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/14.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/15@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/15.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/16@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/16.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/17@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/17.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/18@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/18.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_cycloid@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/cycloid/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Cycloid]]></video:title>
      <video:description><![CDATA[A stone got stuck in the wheel tread. In what direction will it fly when it leaves the tread?]]></video:description>
      <video:duration>147</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/ellipse/</loc>
    <lastmod>2006-11-16</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/01@hd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/01.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/02@hd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/02.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/03@hd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/03.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_ellipse@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/ellipse/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Ellipse]]></video:title>
      <video:description><![CDATA[Draw an ellipse using string and two nails.]]></video:description>
      <video:duration>99</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/polyhedra-net/</loc>
    <lastmod>2006-10-04</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/01@fhd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/01@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/01.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/02@fhd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/02@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/02.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/03@fhd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/03@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/03.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/04@fhd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/04@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/04.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/05@fhd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/05@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/05.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/06@fhd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/06@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/06.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_polyhedra-net@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/polyhedra-net/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[The net]]></video:title>
      <video:description><![CDATA[What is the net of a polyhedron you may ask. It is simply a sheet of cardboard whose folding gives the polyhedron. This is true, but there’s more. The concept of the net of a polyhedron contains something more than just a sheet of cardboard.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/parabolic-antenna/</loc>
    <lastmod>2006-05-27</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/01@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/01.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/02@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/02.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/03@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/03.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/04@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/04.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/05@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/05.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/06@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/06.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/07@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/07.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/08@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/08.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_parabolic-antenna@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Parabolic antenna]]></video:title>
      <video:description><![CDATA[Why do the majority of parabolic antennas resemble each other? To find the answer just remember school mathematics.]]></video:description>
      <video:duration>159</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/magnitsky/</loc>
    <lastmod>2006-05-26</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/01@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/01.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/02@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/02.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/03@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/03.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/04@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/04.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/05_1@fhd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/05_1@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/05_1.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/05_2@fhd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/05_2@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/05_2.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Magnitsky.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/magnitsky/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Arithmetic by Magnitsky]]></video:title>
      <video:description><![CDATA[In 1703, Peter the Great organised the publication of the first Russian mathematics textbook. The "Arithmetic" of Leonty Philippovich Magnitsky is published. And during the Great Northern War the tsar edits a geometry textbook himself...]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/cubic-parquet/</loc>
    <lastmod>2006-03-21</lastmod>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_cubic-parquet@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/cubic-parquet/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Cubist parquet]]></video:title>
      <video:description><![CDATA[How many distinct cube nets exist? It’s interesting that any of them can be used to parquet your room.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/polyhedra-embedding/</loc>
    <lastmod>2006-01-24</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/01@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/01.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/02@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/02.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/03@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/03.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/04@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/04.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/05@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/05.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/06@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/06.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/07@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/07.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/08@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/08.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/09@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/09.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/10@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/10.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/11@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/11.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_polyhedra-embedding@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Piecewise linear embedding of a polyhedron]]></video:title>
      <video:description><![CDATA[Can one fold a development of a polyhedron into a closed body, whose borders will be not parts of planes but rather pieces of smooth surfaces?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/figures-area/</loc>
    <lastmod>2006-01-09</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/01@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/01.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/02@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/02.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/03@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/03.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/04@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/04.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/05@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/05.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/06@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/06.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/07@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/07.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/08@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/08.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/09@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/09.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/10@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/10.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/11@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/11.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/12@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/12.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_figures-area@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/figures-area/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Plane areas]]></video:title>
      <video:description><![CDATA[The area of a square equals to the square of it’s side length. It’s easy to compute the area of a figure that is built of several squares. And what is the area of a figure bounded by an arbitrary curve?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/fold-cut-problem/</loc>
    <lastmod>2005-11-16</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/01@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/01@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/01.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/02@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/02@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/02.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/03@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/03@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/03.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/04@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/04@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/04.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/05@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/05@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/05.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/06@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/06@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/06.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/07@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/07@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/07.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/08@fhd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/08@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/08.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_fold-cut-problem@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[With a single cut]]></video:title>
      <video:description><![CDATA[Let’s take a sheet of paper and draw an arbitrary polygon. Is it possible to fold the sheet so that the polygon could be cut out with a single straight slit?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/reuleaux-triangle/</loc>
    <lastmod>2005-03-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/01@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/01.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/02@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/02.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/03@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/03.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/04@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/04.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/05@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/05.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/06@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/06.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/07@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/07.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/08@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/08.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/09@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/09.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/10@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/10.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/11@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/11.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/12@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/12.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/13@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/13.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/14@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/14.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/15@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/15.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/16@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/16.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/17@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/17.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/18@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/18.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/19@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/19@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/19.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/20@fhd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/20@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/20.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_Reuleaux-triangle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Circular Reuleaux triangle]]></video:title>
      <video:description><![CDATA[Let’s consider a regular triangle. On each side of the triangle we’ll draw an arc of a circle of radius equal to the length of the side. Received curve is called ”Reuleaux” triangle.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/stairway-to-heaven/</loc>
    <lastmod>2005-02-05</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/01@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/01.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/02@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/02.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/03@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/03.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/04@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/04.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/05@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/05.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/06@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/06.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/07@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/07.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/08@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/08.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/09@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/09.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/10@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
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      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/10.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/11@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/11.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/12@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/12.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/13@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/13.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/14@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/14.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/15@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/15.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/16@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/16.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/17@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/17@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/17.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/18@fhd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/18@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/18.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_stairway-to-heaven@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Stairway to infinity]]></video:title>
      <video:description><![CDATA[Two cars — loader and tractor — build ladder that goes to infinity. Plunged into their work they prove divergence of the harmonic series.]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/polyhedra-volumes/</loc>
    <lastmod>2005-01-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/01@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/01.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/02@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/02.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/03@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/03.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/04@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/04.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/05@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/05.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/06@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/06.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/07@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/07.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/08@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/08.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_polyhedra-volumes@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Amazing volumes of polyhedra]]></video:title>
      <video:description><![CDATA[Is it possible to construct both a nonconvex and a convex polyhedra from the same set of faces? You’d definitely say Yes. Which of them has the greater volume?]]></video:description>
      <video:duration>377</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/etudes/polyhedra-volume-increasing/</loc>
    <lastmod>2005-01-12</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/01@hd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/01.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/02@hd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/02.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/03@hd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/03.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/04@hd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/04.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/05@hd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
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    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/thumb.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/kaleidoscope/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Kaleidoscope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/thumb.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/helix/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Helix]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/thumb.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/rainbow/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Rainbow]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/thumb.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/archimedes/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Sphere volume: Archimedes Scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/thumb.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/geometric-progression-gears/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Geometric progression decrease]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/thumb.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/platonic-solids-harmony/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Regular polyhedra harmony]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/thumb.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shukhov-tower/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Shukhov Tower]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/thumb.jpg</image:loc>
      <image:title><![CDATA[Train wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/train-wheelset/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Train wheels]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/thumb.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/invisible-body/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Invisible body]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/thumb.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/windscreen-wiper/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Hinge mechanisms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/thumb.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/napkin-folding-problem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Folded rouble]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/thumb.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ham-sandwich-theorem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Sandwich problem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/thumb.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/continuity/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Continuity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/thumb.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vernier/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Vernier scale]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/pick-theorem/thumb.jpg</image:loc>
      <image:title><![CDATA[Pick’s formula]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/pick-theorem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Pick’s formula]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/thumb.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-wheelchair/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Wheelchair]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/pythagorean-theorem/thumb.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: Interactive puzzle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/pythagorean-theorem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: Interactive puzzle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/thumb.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/wheel-inventing/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Inventing the wheel]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/thumb.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/catenary/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Catenary]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/thumb.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/steering-geometry/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Steering geometry]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/thumb.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/flexible-polyhedra/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Flexible polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/thumb.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/monge-theorem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Leaving the plane]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/thumb.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ball-volume/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Ball volume]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/thumb.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/shadows/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Shadows]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/thumb.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/axioms/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Axioms]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/thumb.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-sorting-mechanism/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Sorting mechanism]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/thumb.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/translation-rotation/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Translation and rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/thumb.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/underground/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[How deep is the underground station]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/thumb.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/angle-trisection/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Angle trisection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/thumb.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/degrees-of-freedom/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Degrees of freedom]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/thumb.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/lipkin-inversor/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Lipkin linkage]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/thumb.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/vintage-computers/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Computer engineering in the 1950s]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/thumb.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/tchebyshev-plantigrade-machine/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Plantigrade machine]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/thumb.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/durer-conjecture/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Anti-Durer]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/thumb.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ray-screening/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Screen a ray]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/thumb.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/jacobi-polynomials/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Nice construction]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/thumb.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/corner-reflector/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/thumb.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/drilling-square-holes/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Drilling square holes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/thumb.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-development/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[And this is a net?!]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/thumb.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cycloid/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Cycloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/thumb.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/ellipse/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Ellipse]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/thumb.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-net/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[The net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/thumb.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/parabolic-antenna/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic antenna]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/thumb.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/magnitsky/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Arithmetic by Magnitsky]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cubic-parquet/thumb.jpg</image:loc>
      <image:title><![CDATA[Cubist parquet]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/cubic-parquet/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Cubist parquet]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/thumb.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-embedding/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Piecewise linear embedding of a polyhedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/thumb.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/figures-area/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Plane areas]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/thumb.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/fold-cut-problem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[With a single cut]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/thumb.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/reuleaux-triangle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Circular Reuleaux triangle]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/thumb.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/stairway-to-heaven/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Stairway to infinity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/thumb.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volumes/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Amazing volumes of polyhedra]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/thumb.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/polyhedra-volume-increasing/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Volume increasing]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/contact-number/thumb.jpg</image:loc>
      <image:title><![CDATA[Contact number]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/etudes/contact-number/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Contact number]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/loop-the-loop/</loc>
    <lastmod>2026-10-27</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/01@hd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/01.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/02@hd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/02.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/03@hd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/03.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/04@hd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/04.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/05@hd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/05.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/06@hd.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/06.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_loop-the-loop@fhd.mp4</video:content_loc>
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      <video:title><![CDATA[Мёртвая петля]]></video:title>
      <video:description><![CDATA[Мёртвая петля (loop-the-loop): прохождение полной петли, отрыв при подъёме, качение в нижней части]]></video:description>
      <video:duration>37</video:duration>
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    <lastmod>2026-10-20</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/01@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/01.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/02@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/02.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/03@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/03.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/04@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/05@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/05.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/06@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/06.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
    </image:image>
    <video:video>
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      <video:title><![CDATA[Олоид]]></video:title>
      <video:description><![CDATA[Олоид: простое тело с занимательными свойствами.]]></video:description>
      <video:duration>82</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/Bernoulli-lemniscate/</loc>
    <lastmod>2026-09-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Bernoulli-lemniscate/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Лемниската Бернулли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Bernoulli-lemniscate/01@hd.jpg</image:loc>
      <image:title><![CDATA[Лемниската Бернулли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Bernoulli-lemniscate/01.jpg</image:loc>
      <image:title><![CDATA[Лемниската Бернулли]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/solid-figures-threaded-net/</loc>
    <lastmod>2026-04-28</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/01@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/01.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/02@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/02.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/03@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/03.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/04@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/04.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/05@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/05.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/06@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/06.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/07@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/07.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/08@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/08.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/09@hd.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/09.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
    </image:image>
    <video:video>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></video:title>
      <video:description><![CDATA[«Живые» развёртки стереометрических фигур.]]></video:description>
      <video:duration>60</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/squaring-the-square-pendant/</loc>
    <lastmod>2026-03-03</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square-pendant/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата: кулон]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square-pendant/01@hd.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата: кулон]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square-pendant/01.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата: кулон]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/ambigram-square-circle/</loc>
    <lastmod>2026-01-27</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/01@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/01.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/02@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/02.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/03@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/03.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/04@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/04.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/05@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/05.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/06@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/06.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/07@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
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      <video:description><![CDATA[Волновой маятник Чеботаева: дискретизация синусоиды.]]></video:description>
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      <video:title><![CDATA[Танцующие окружности]]></video:title>
      <video:description><![CDATA[Science Art: спаянные под углом окружности «перекатываются» друг по другу.]]></video:description>
      <video:duration>36</video:duration>
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      <video:description><![CDATA[Классическая физическая демонстрация: маятник с песком рисует синусоиду.]]></video:description>
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      <image:title><![CDATA[Конические сечения: развёртка]]></image:title>
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      <image:title><![CDATA[Конические сечения: развёртка]]></image:title>
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      <image:title><![CDATA[Календарь-головоломка]]></image:title>
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      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/09@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/09.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/10@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/10.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/11@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/11.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/12@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/12.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Archimedes-trammel@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/Archimedes-trammel/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Эллипсограф: теорема Коперника]]></video:title>
      <video:description><![CDATA[Теорема Коперника: точка окружности, катящейся без проскальзывания внутри окружности в два раза большего радиуса, вычерчивает её диаметр.]]></video:description>
      <video:duration>190</video:duration>
    </video:video>
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  <url>
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    <lastmod>2023-09-19</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/01@hd.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/01.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/02@hd.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/02.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/constant-width-curves-board-models/</loc>
    <lastmod>2023-05-30</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/01@hd.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/01.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/02@hd.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/02.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/constant-width-curves-cart/</loc>
    <lastmod>2023-05-23</lastmod>
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      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_constant-width-curves-cart@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/constant-width-curves-cart/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Постоянная ширина: тележка]]></video:title>
      <video:description><![CDATA[Модель, демонстрирующая понятие постоянной ширины фигуры.]]></video:description>
      <video:duration>32</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/circumscribed-circle-paper-model/</loc>
    <lastmod>2023-05-16</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/01@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/01.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/02@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/02.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/03@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/03.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/04@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/04.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/05@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/05.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/06@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/06.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/07@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/07.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/08@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/08.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/09@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/09.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_circumscribed-circle-paper-model@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Описанная окружность: модель из бумаги]]></video:title>
      <video:description><![CDATA[Центр описанной окружности — пересечение серединных перпендикуляров.]]></video:description>
      <video:duration>113</video:duration>
    </video:video>
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    <loc>https://en.etudes.ru/models/road-manholes/</loc>
    <lastmod>2023-05-09</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/01@hd.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/01.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/02@hd.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/02.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-set/</loc>
    <lastmod>2023-05-02</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-set/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: простейшая модель]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-set/01@hd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: простейшая модель]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-set/01.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: простейшая модель]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/parallelogram-area/</loc>
    <lastmod>2023-04-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/01@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/01.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/02@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/02.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/03@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/03.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/04@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/04.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/rigidity-geometry/</loc>
    <lastmod>2023-04-18</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/01@hd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/01.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/02@hd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/02.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/03@hd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/03.jpg</image:loc>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/04.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/05@hd.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/05.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/06@hd.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/06.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Earth-figure-silicone-ball@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/Earth-figure/poster-silicone-ball@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Фигура Земли]]></video:title>
      <video:description><![CDATA[Фигура Земли — сжатый вдоль оси эллипсоид вращения.]]></video:description>
      <video:duration>49</video:duration>
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      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Earth-figure-centripetal-spinner@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/Earth-figure/poster-centripetal-spinner@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Фигура Земли]]></video:title>
      <video:description><![CDATA[Фигура Земли — сжатый вдоль оси эллипсоид вращения.]]></video:description>
      <video:duration>25</video:duration>
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    <lastmod>2022-10-04</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/01@hd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/01.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/02@hd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/02.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/03@hd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/03.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Mobius-strip-souvenir@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Лента Мёбиуса]]></video:title>
      <video:description><![CDATA[Лента Мёбиуса — односторонняя неориентируемая поверхность с краем.]]></video:description>
      <video:duration>38</video:duration>
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    <loc>https://en.etudes.ru/models/tetrahedrons-in-dodecahedron/</loc>
    <lastmod>2022-09-27</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/01@hd.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/01.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/02@hd.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/02.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
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    <loc>https://en.etudes.ru/models/ellipse-and-circle/</loc>
    <lastmod>2022-09-20</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/01@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/01.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/02@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/02.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/03@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/03.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/04@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/04.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/05@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/05.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/06@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/06.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/07@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/07.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/skewed-wheels/</loc>
    <lastmod>2022-09-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/01@hd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/01.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/02@hd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/02.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/03@hd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/03.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/04@hd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/04.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_skewed-wheels@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/skewed-wheels/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Косые колёса]]></video:title>
      <video:description><![CDATA[Косые колёса едущие прямо.]]></video:description>
      <video:duration>90</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/square-in-the-bag/</loc>
    <lastmod>2022-05-17</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/01@hd.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/01.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/02@hd.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/02.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-ellipse-gears/</loc>
    <lastmod>2022-05-10</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/01@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/01.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/02@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/02.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/03@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/03.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/04@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/04.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/05@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/05.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/06@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/06.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/07@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/07.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/08@fhd.jpg</image:loc>
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    <image:image>
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    <image:image>
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      <image:title><![CDATA[Задача о диване]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Задача о диване]]></image:title>
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      <image:title><![CDATA[Чётность калейдоскопа]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/kaleidoscope-parity/01@hd.jpg</image:loc>
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      <image:title><![CDATA[Чётность калейдоскопа]]></image:title>
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      <image:title><![CDATA[Чётность калейдоскопа]]></image:title>
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      <image:title><![CDATA[Механическая ракета]]></image:title>
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    <lastmod>2022-04-05</lastmod>
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      <image:title><![CDATA[Домики и колодцы: кружка]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Домики и колодцы: кружка]]></image:title>
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    <image:image>
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    <lastmod>2022-03-22</lastmod>
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    <lastmod>2022-03-15</lastmod>
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      <video:duration>62</video:duration>
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      <image:title><![CDATA[Кардиоида и нефроида]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/cardioid-nephroid/01.jpg</image:loc>
      <image:title><![CDATA[Кардиоида и нефроида]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cardioid-nephroid/02@fhd.jpg</image:loc>
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    <loc>https://en.etudes.ru/models/conic-sections-hyperboloid-pencil-holder/</loc>
    <lastmod>2022-03-01</lastmod>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-pencil-holder/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Карандашница]]></video:title>
      <video:description><![CDATA[Карандашница — однополостный гиперболоид.]]></video:description>
      <video:duration>36</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-hyperboloid-rattle/</loc>
    <lastmod>2022-02-22</lastmod>
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      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections-hyperboloid-rattle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-rattle/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Гиперболоидная трещотка]]></video:title>
      <video:description><![CDATA[Гиперболоидная трещотка — детская игрушка, научный сувенир, пугало для птиц на дачном участке.]]></video:description>
      <video:duration>43</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/pythagorean-converse-theorem/</loc>
    <lastmod>2022-02-08</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-converse-theorem/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Обратная теорема Пифагора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-converse-theorem/01@hd.jpg</image:loc>
      <image:title><![CDATA[Обратная теорема Пифагора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-converse-theorem/01.jpg</image:loc>
      <image:title><![CDATA[Обратная теорема Пифагора]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_keychain-puzzle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/pythagorean-converse-theorem/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Обратная теорема Пифагора]]></video:title>
      <video:description><![CDATA[Обратная теорема Пифагора: верёвочная модель.]]></video:description>
      <video:duration>33</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/keychain-puzzle/</loc>
    <lastmod>2022-02-01</lastmod>
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      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/01@hd.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/01.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/02@hd.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/02.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/03@hd.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/03.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_keychain-puzzle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/keychain-puzzle/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Брелок «Монетка»]]></video:title>
      <video:description><![CDATA[Научный сувенир-брелок «Монетка»: центробежная сила помогает решить задачу.]]></video:description>
      <video:duration>33</video:duration>
    </video:video>
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    <loc>https://en.etudes.ru/models/Miura-fold/</loc>
    <lastmod>2022-01-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/01@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/01.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/02@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/02.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/03@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/03.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/04@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/04.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/05@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/05.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/06@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/06.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Miura-fold@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/Miura-fold/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Miura fold]]></video:title>
      <video:description><![CDATA[Miura fold — жёсткое оригами, позволяющее однозначно складывать лист.]]></video:description>
      <video:duration>107</video:duration>
    </video:video>
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    <loc>https://en.etudes.ru/models/Fibonacci-spiral-tiling/</loc>
    <lastmod>2022-01-18</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/01@hd.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/01.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/02@hd.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/02.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-hyperboloid-whirligig/</loc>
    <lastmod>2021-12-28</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/01@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/01.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/02@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/02.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/03@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/03.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/04@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/04.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections-hyperboloid-whirligig@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></video:title>
      <video:description><![CDATA[Завораживающая модель однополостного гиперболоида: пуговица на верёвочке.]]></video:description>
      <video:duration>50</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-elliptical-billiard/</loc>
    <lastmod>2021-12-14</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/01@hd.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/01.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/02@hd.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/02.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections-elliptical-billiard@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Эллиптический бильярд]]></video:title>
      <video:description><![CDATA[Эллиптический бильярд позволяет сыграть беспроигрышную партию!]]></video:description>
      <video:duration>45</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/two-piece-tetrahedron/</loc>
    <lastmod>2021-12-07</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/01@hd.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/01.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/02@hd.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/02.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
  </url>
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    <loc>https://en.etudes.ru/models/cube-rotation/</loc>
    <lastmod>2021-11-30</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/01@hd.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/01.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/02@hd.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/02.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_cube-rotation@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/cube-rotation/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Вращающийся куб]]></video:title>
      <video:description><![CDATA[Вращающийся вокруг диагонали рёберный куб может служить и артобъектом, и источником задач для размышления.]]></video:description>
      <video:duration>32</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/Hamiltonian-Eulerian-paths/</loc>
    <lastmod>2021-11-23</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/01@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/01.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/02@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/02.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/03@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/03.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/04@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/04.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/05@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/05.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/06@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/06.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/07@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/07.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/prince-Rupert-cube/</loc>
    <lastmod>2021-11-09</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/01@hd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/01.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/02@hd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/02.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/03@hd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/03.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_prince-Rupert-cube@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Куб принца Руперта]]></video:title>
      <video:description><![CDATA[Можно ли в кубе проделать отверстие, через которое пройдёт такой же куб?.]]></video:description>
      <video:duration>95</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/truncated-mirror-pyramid/</loc>
    <lastmod>2021-11-02</lastmod>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_truncated-mirror-pyramid@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/truncated-mirror-pyramid/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Усечённая зеркальная пирамида]]></video:title>
      <video:description><![CDATA[Усечённая зеркальная пирамида позволяет сделать интересные фото на память.]]></video:description>
      <video:duration>25</video:duration>
    </video:video>
  </url>
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    <lastmod>2021-10-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/01@hd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/01.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/02@hd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/02.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/03@hd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/03.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/04@hd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/04.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_stair-length@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/stair-length/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Длина лестницы]]></video:title>
      <video:description><![CDATA[Опровержение теоремы Пифагора: как «доказать» что гипотенуза равна сумме катетов.]]></video:description>
      <video:duration>101</video:duration>
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  <url>
    <loc>https://en.etudes.ru/models/universal-plug/</loc>
    <lastmod>2021-10-19</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/01@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/01.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/02@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/02.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/03@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/03.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/04@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/04.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/05@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/05.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/06@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/06.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/07@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/07.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/08@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/08.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/09@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/09.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/10@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/10.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/11@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/11.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/12@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/12.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
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    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_universal-plug@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/universal-plug/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Универсальная пробка]]></video:title>
      <video:description><![CDATA[Универсальная пробка для круглого, квадратного и треугольного отверстий.]]></video:description>
      <video:duration>134</video:duration>
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  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-assembly-kit/</loc>
    <lastmod>2021-10-05</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
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      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
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      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/01.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/02@hd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/02.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/cube-rotation-axis/</loc>
    <lastmod>2021-09-28</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation-axis/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation-axis/01@hd.jpg</image:loc>
      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation-axis/01.jpg</image:loc>
      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation-axis/02.jpg</image:loc>
      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
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      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/04.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/05@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/05.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/06@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/06.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/07@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/07.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/08@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/08.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/09@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/09.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/10@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/10.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/11@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/11.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/12@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/12.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/13@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/13.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/14@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/14.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/15@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/15.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/16@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
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    <image:image>
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    <image:image>
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    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
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    <lastmod>2021-04-13</lastmod>
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      <image:title><![CDATA[Мираж]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Мираж]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/02.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/03@hd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/03.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/04.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/05@hd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/05.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/06@hd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/06.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <video:video>
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      <video:title><![CDATA[Мираж]]></video:title>
      <video:description><![CDATA[Параболоидная «голограмма»]]></video:description>
      <video:duration>84</video:duration>
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    <loc>https://en.etudes.ru/models/conic-sections-ellipsoid-circles/</loc>
    <lastmod>2021-04-06</lastmod>
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      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/01@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/01.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/02@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/02.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/03@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/03.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/04@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/04.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/05@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/05.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/06@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/06.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/07@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/07.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/08@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/08.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/09@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/09.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <video:video>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Окружности на эллипсоиде]]></video:title>
      <video:description><![CDATA[На поверхности эллипсоида лежат два семейства окружностей.]]></video:description>
      <video:duration>104</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/harmonic-series/</loc>
    <lastmod>2021-03-30</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/harmonic-series/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Harmonic series]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/harmonic-series/01@hd.jpg</image:loc>
      <image:title><![CDATA[Harmonic series]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/harmonic-series/01.jpg</image:loc>
      <image:title><![CDATA[Harmonic series]]></image:title>
    </image:image>
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    <loc>https://en.etudes.ru/models/partition-into-trapezoids/</loc>
    <lastmod>2021-03-23</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/01@hd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/01.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/02@hd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/02.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/03@hd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/03.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
  </url>
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    <loc>https://en.etudes.ru/models/triangle-sum-of-angles/</loc>
    <lastmod>2021-03-16</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/01@hd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/01.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/02@hd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/02.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/03@hd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/03.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/04@hd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/04.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/05@hd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/05.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_triangle-sum-of-angles@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/poster-triangle-sum-of-angles@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Сумма внутренних углов треугольника]]></video:title>
      <video:description><![CDATA[Сумма внутренних углов треугольника равна 180°. На плоскости.]]></video:description>
      <video:duration>31</video:duration>
    </video:video>
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    <loc>https://en.etudes.ru/models/conic-sections-hyperboloid-generatix-rotation/</loc>
    <lastmod>2021-03-09</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/01@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/01.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/02@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/02.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/03@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/03.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/04@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/04.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/05@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/05.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/06@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/06.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/poster-hyperboloid-generatix-rotation@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Hyperboloid generatix rotation]]></video:title>
      <video:description><![CDATA[Straight rod passing though a curved hole!]]></video:description>
      <video:duration>36</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_hyperboloid-scew-line-rotation@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Hyperboloid generatix rotation]]></video:title>
      <video:description><![CDATA[Straight rod passing though a curved hole!]]></video:description>
      <video:duration>59</video:duration>
    </video:video>
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  <url>
    <loc>https://en.etudes.ru/models/pythagorean-theorem-earrings/</loc>
    <lastmod>2021-03-02</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/01@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/01.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/02@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/02.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/03@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/03.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/04@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/04.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/05@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/05.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/Riemann-integral/</loc>
    <lastmod>2021-02-23</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/01@hd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/01.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/02@hd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/02.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/03@hd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/03.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/04@hd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/04.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Riemann-integral@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/Riemann-integral/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Интеграл Римана]]></video:title>
      <video:description><![CDATA[Первое знакомство с интегралом: площадь под графиком функции.]]></video:description>
      <video:duration>76</video:duration>
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  <url>
    <loc>https://en.etudes.ru/models/sieve-of-eratosthenes/</loc>
    <lastmod>2021-02-16</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/01@hd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/01.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/02@hd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/02.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/03@hd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/03.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/04@hd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/04.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/05@hd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/05.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_sieve-of-eratosthenes@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/poster-sieve-of-eratosthenes@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Решето Эратосфена]]></video:title>
      <video:description><![CDATA[Простая для использования учителем реализация решета Эратосфена.]]></video:description>
      <video:duration>47</video:duration>
    </video:video>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-circle-top/01@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-circle-top/06@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-circle-top/06.jpg</image:loc>
      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
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      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_inscribed-circle-top@fhd.mp4</video:content_loc>
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      <video:title><![CDATA[Вписанная окружность: волчок]]></video:title>
      <video:description><![CDATA[Вписанная окружность треугольника: не нарисованная, но видимая.]]></video:description>
      <video:duration>51</video:duration>
    </video:video>
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    <loc>https://en.etudes.ru/models/number-cubes/</loc>
    <lastmod>2021-02-02</lastmod>
    <image:image>
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      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/01@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/01.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/02@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/02.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/03@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/03.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/04@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/04.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/05@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/05.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/06@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/06.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/07@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/07.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/08@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/08.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/09@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/09.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
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    <loc>https://en.etudes.ru/models/cube-capacity/</loc>
    <lastmod>2021-01-26</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/01@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/01.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/02@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/02.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/03@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/03.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/04@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/04.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/05@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/06@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/06.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <video:video>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/cube-capacity/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Cube capacity]]></video:title>
      <video:description><![CDATA[How big tetrahedron can fit into a cube?]]></video:description>
      <video:duration>137</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/pythagorean-theorem-sand-proof/</loc>
    <lastmod>2021-01-12</lastmod>
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      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/01@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/01.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/03.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/10@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/10.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/11@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/11.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
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    </image:image>
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      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/12@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
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      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/13@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/13.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/14@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/14.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Pythagorean-theorem-sand-proof@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Pythagorean Theorem: illustration with sand]]></video:title>
      <video:description><![CDATA[Illustration and proofs of Pythagorean theorem.]]></video:description>
      <video:duration>53</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/binary-magic/</loc>
    <lastmod>2021-01-05</lastmod>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/fibonacci-numbers-missing-square-puzzle/</loc>
    <lastmod>2020-12-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/01@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/01.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/02@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/02.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/03@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/03.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/04@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/04.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/05@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/05.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/06@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/06.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/07@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/07.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/08@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/08.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/09@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/09.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/cube-cross-sections/</loc>
    <lastmod>2020-12-22</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/01@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/01.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/02@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/02.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/03@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/03.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/04@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/04.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/05@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/05.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/06@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/06.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/07@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/07.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/08@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/08.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/09@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/09.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_cube-cross-sections@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/cube-cross-sections/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Сечения куба]]></video:title>
      <video:description><![CDATA[Простая в изготовлении, но наглядная модель, демонстрирующая сечения куба.]]></video:description>
      <video:duration>120</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/stereographic-projection/</loc>
    <lastmod>2020-12-15</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/01@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/01.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/02@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/02.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/03@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/03.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/04@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/04.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/05@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/05.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/06@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/06.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_stereographic-projection@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/stereographic-projection/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Stereographic projection]]></video:title>
      <video:description><![CDATA[Rectangular grid as the shadow of a spherical model.]]></video:description>
      <video:duration>115</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/geometric-progression-sum/</loc>
    <lastmod>2020-12-08</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/01@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/01.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/02@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/02.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/03@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/03.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-hyperbola-surface-tension/</loc>
    <lastmod>2020-12-01</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/01@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/01.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/02@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/02.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/03@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/03.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/04@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/04.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/05@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/05.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_hyperbola-surface-tension@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Hyperbole: the surface tension of water]]></video:title>
      <video:description><![CDATA[Hyperbola at home can be "drawn" by surface tension forces.]]></video:description>
      <video:duration>48</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/sine-wave/</loc>
    <lastmod>2020-11-24</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/01@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/01.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/02@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/02.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/03@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/03.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/04@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/04.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/05@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/05.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/06@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/06.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/07@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/07.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/08@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/08.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/09@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/09.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_sine-wave-sausage@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/sine-wave/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sine wave: cylinder net]]></video:title>
      <video:description><![CDATA[The sine graph can be obtained as a "sliced off" cylinder (or with an ellipse drawn on it)]]></video:description>
      <video:duration>45</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_sine-wave-cylinder-development@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/sine-wave/poster-sine-wave-cylinder-development@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sine wave: cylinder net]]></video:title>
      <video:description><![CDATA[The sine graph can be obtained as a "sliced off" cylinder (or with an ellipse drawn on it)]]></video:description>
      <video:duration>29</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_sine-wave-cylinder-rolling@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/sine-wave/poster-sine-wave-cylinder-rolling@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sine wave: cylinder net]]></video:title>
      <video:description><![CDATA[The sine graph can be obtained as a "sliced off" cylinder (or with an ellipse drawn on it)]]></video:description>
      <video:duration>31</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/corner-reflector/</loc>
    <lastmod>2020-11-17</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/01@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/01.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/02@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/02.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/03@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/03.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/04@hd.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/corner-reflector/04.jpg</image:loc>
      <image:title><![CDATA[Corner reflector]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-confocal-ellipses/</loc>
    <lastmod>2020-11-10</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/01@hd.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/01.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/02@hd.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/02.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/03@hd.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/03.jpg</image:loc>
      <image:title><![CDATA[Grave’s confocal ellipses]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_confocal-ellipses@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Grave’s confocal ellipses]]></video:title>
      <video:description><![CDATA[Whenever you move from a circle to an ellipse, elementary statements arise that have no elementary proof.]]></video:description>
      <video:duration>80</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-hyperbolic-paraboloid-carboard-model/</loc>
    <lastmod>2020-11-03</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbolic-paraboloid-carboard-model/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Hyperbolic paraboloid: a cardboard model]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbolic-paraboloid-carboard-model/01@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbolic paraboloid: a cardboard model]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbolic-paraboloid-carboard-model/01.jpg</image:loc>
      <image:title><![CDATA[Hyperbolic paraboloid: a cardboard model]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/lobachevskian-plane-models/</loc>
    <lastmod>2020-10-27</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/01@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/01.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/02@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/02.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/03@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/03.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/04@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/04.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/05@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/05.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/06@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/06.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/07@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/07.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/08@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/08.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/09@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/09.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/10@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/10.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/11@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/11.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/12@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/12.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/13@hd.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/13.jpg</image:loc>
      <image:title><![CDATA[Three Lobachevskian plane models]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Lobachevskian-plane-models@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/lobachevskian-plane-models/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Three Lobachevskian plane models]]></video:title>
      <video:description><![CDATA[A transparent hemisphere with marked circles perpendicular to the equator delivers three models of the Lobachevsky plane at once.]]></video:description>
      <video:duration>98</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-moire/</loc>
    <lastmod>2020-02-07</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-moire/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections: moiré]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-moire/01@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections: moiré]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-moire/01.jpg</image:loc>
      <image:title><![CDATA[Conic sections: moiré]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-moire/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections: moiré]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-moire/02@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections: moiré]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-moire/02.jpg</image:loc>
      <image:title><![CDATA[Conic sections: moiré]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/dihedral-group/</loc>
    <lastmod>2018-12-24</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/01@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/01.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/02@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/02.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/03@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/03.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/04@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/04.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/05@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/05.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/06@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/06.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/07@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/07.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/08@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/08.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/09@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/09.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/10@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/10.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/11@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/11@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/11.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/12@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/12@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/12.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/13@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/13@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/13.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/14@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/14@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/14.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/15@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/15@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/15.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/16@fhd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/16@hd.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dihedral-group/16.jpg</image:loc>
      <image:title><![CDATA[Dihedral group]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_dihedral-group@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/dihedral-group/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Dihedral group]]></video:title>
      <video:description><![CDATA[A mirror angle is a simplest kaleidoscope that produces regular polygons.]]></video:description>
      <video:duration>98</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-revolution-paraboloid/</loc>
    <lastmod>2018-12-12</lastmod>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_paraboloid-in-glass@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-revolution-paraboloid/poster-conic-sections_paraboloid-in-glass@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Параболоид вращения]]></video:title>
      <video:description><![CDATA[При вращении сосуда с жидкостью её поверхность принимает форму параболоида вращения.]]></video:description>
      <video:duration>41</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_paraboloid-in-cylinder@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-revolution-paraboloid/poster-conic-sections_paraboloid-in-cylinder@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Параболоид вращения]]></video:title>
      <video:description><![CDATA[При вращении сосуда с жидкостью её поверхность принимает форму параболоида вращения.]]></video:description>
      <video:duration>46</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_paraboloid-in-box@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-revolution-paraboloid/poster-conic-sections_paraboloid-in-box@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Параболоид вращения]]></video:title>
      <video:description><![CDATA[При вращении сосуда с жидкостью её поверхность принимает форму параболоида вращения.]]></video:description>
      <video:duration>43</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-parabola-drop/</loc>
    <lastmod>2018-12-11</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/01@hd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/01.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/02@hd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/02.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/03@hd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/03.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/04@hd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/04.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/05@hd.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/05.jpg</image:loc>
      <image:title><![CDATA[Падение по параболе]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabola-drop@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabola-drop/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Падение по параболе]]></video:title>
      <video:description><![CDATA[Демонстрация движения по параболе в поле силы тяжести.]]></video:description>
      <video:duration>25</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-parabolic-whisperings/</loc>
    <lastmod>2018-12-10</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/01@hd.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/01.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/02@hd.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/02.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/03@hd.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/03.jpg</image:loc>
      <image:title><![CDATA[Параболическая шепталка]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabolic-whisperings@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-whisperings/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Параболическая шепталка]]></video:title>
      <video:description><![CDATA[Передача звука на большие расстояния.]]></video:description>
      <video:duration>33</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-parabola-reflective-property/</loc>
    <lastmod>2018-12-09</lastmod>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabolic-plate@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabola-reflective-property/poster-conic-sections_parabolic-plate@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Parabola: optical property]]></video:title>
      <video:description><![CDATA[The optical property of the parabola is the basis of the parabola's many applications in our life.]]></video:description>
      <video:duration>27</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabolic-lighter@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabola-reflective-property/poster-conic-sections_parabolic-lighter@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Parabola: optical property]]></video:title>
      <video:description><![CDATA[The optical property of the parabola is the basis of the parabola's many applications in our life.]]></video:description>
      <video:duration>24</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabolic-mirrors@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabola-reflective-property/poster-conic-sections_parabolic-mirrors@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Parabola: optical property]]></video:title>
      <video:description><![CDATA[The optical property of the parabola is the basis of the parabola's many applications in our life.]]></video:description>
      <video:duration>23</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabolic-kitchen@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabola-reflective-property/poster-conic-sections_parabolic-kitchen@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Parabola: optical property]]></video:title>
      <video:description><![CDATA[The optical property of the parabola is the basis of the parabola's many applications in our life.]]></video:description>
      <video:duration>33</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-parabolic-billiard/</loc>
    <lastmod>2018-12-05</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/01@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/01.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/02@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/02.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/03@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/03.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/04@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/04.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/05@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/05.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/06@hd.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/06.jpg</image:loc>
      <image:title><![CDATA[Parabolic billiard]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabolic-billiard@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-billiard/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Parabolic billiard]]></video:title>
      <video:description><![CDATA[A ball rolling down the slide in a parabolic billiard always makes it to the pocket!]]></video:description>
      <video:duration>54</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/football-mirror-icosahedron/</loc>
    <lastmod>2018-06-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/01@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/01.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/02@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/02.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/03@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/03.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/04@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/04.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/05@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/05.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/06@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/06.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/07@hd.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/07.jpg</image:loc>
      <image:title><![CDATA[Football: mirror icosahedron]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_football-mirror-icosahedron@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/football-mirror-icosahedron/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Football: mirror icosahedron]]></video:title>
      <video:description><![CDATA[Three triangular mirrors, some duct tape and a triangle painted in two colors, combined with the theory of reflection groups allow you to demonstrate an interesting model of a classic soccer ball to your friends.]]></video:description>
      <video:duration>62</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-chips-hyperbolic-paraboloid/</loc>
    <lastmod>2018-06-05</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/01@hd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/01.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/02@hd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/02.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/03@hd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/03.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/04@hd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/04.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/05@hd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/05.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/06@hd.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/06.jpg</image:loc>
      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_chips-hyperbolic-paraboloid@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-chips-hyperbolic-paraboloid/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Chips: hyperbolic paraboloid]]></video:title>
      <video:description><![CDATA[Сhips, packed in a cylindric tube, have a shape of a hyperbolic paraboloid, so they can pass through a narrow hole without breaking!]]></video:description>
      <video:duration>78</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-sadle-hyperbolic-paraboloid/</loc>
    <lastmod>2018-03-29</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/01@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/01.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/02@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/02.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/03@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/03.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/04@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/04.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/05@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/05.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/06@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/06.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/07@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/07.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/08@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/08.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/09@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/09.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/10@fhd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/10@hd.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/10.jpg</image:loc>
      <image:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_sadle-hyperbolic-paraboloid@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-sadle-hyperbolic-paraboloid/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Saddle surface of a hyperbolic paraboloid]]></video:title>
      <video:description><![CDATA[A surface of a hyperbolic paraboloid looks like a saddle, but it can be formed by a movement of a straight line.]]></video:description>
      <video:duration>149</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/number-pi/</loc>
    <lastmod>2018-03-14</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/01@hd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/01.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/02@hd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/02.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/03@hd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/03.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/04@hd.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-pi/04.jpg</image:loc>
      <image:title><![CDATA[Number π]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_number-pi@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/number-pi/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Number π]]></video:title>
      <video:description><![CDATA[A simple to do demonstration that the number π equals “three and change”.]]></video:description>
      <video:duration>64</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/educated-monkey/</loc>
    <lastmod>2018-02-15</lastmod>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-parabola-geometric-definition/</loc>
    <lastmod>2017-09-02</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/01@hd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/01.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/02@hd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/02.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/03@hd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/03.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/04@hd.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/04.jpg</image:loc>
      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_parabola-geometric-definition@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-parabola-geometric-definition/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Plotting a parabola. Geometric definition]]></video:title>
      <video:description><![CDATA[Drawing a parabola with a thread according to its geometric definition.]]></video:description>
      <video:duration>46</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-cavalieri-parabolograf/</loc>
    <lastmod>2017-09-01</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/01@hd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/01.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/02@hd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/02.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/03@hd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/03.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/04@hd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/04.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/05@hd.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/05.jpg</image:loc>
      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_Cavalieri-parabolograf@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-cavalieri-parabolograf/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Cavalieri’s parabolograph]]></video:title>
      <video:description><![CDATA[A XVII century tool for drawing parabola, whose functioning is based on a theorem from a modern school mathematics course.]]></video:description>
      <video:duration>81</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/trapezium-area/</loc>
    <lastmod>2014-06-02</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/01@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/01.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/02@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/02.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/03@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/03.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/04@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/04.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/05@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/05.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/06@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/06.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/07@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/07.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/08@hd.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/trapezium-area/08.jpg</image:loc>
      <image:title><![CDATA[Trapezoid area]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_area-trapezium-to-rectangle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/trapezium-area/poster-area-trapezium-to-rectangle@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Trapezoid area]]></video:title>
      <video:description><![CDATA[Trapezoid area is equal to half the product of the height and the sum of the two bases.]]></video:description>
      <video:duration>36</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_area-trapezium-to-triangle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/trapezium-area/poster-area-trapezium-to-triangle@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Trapezoid area]]></video:title>
      <video:description><![CDATA[Trapezoid area is equal to half the product of the height and the sum of the two bases.]]></video:description>
      <video:duration>33</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/dudeney-dissection/</loc>
    <lastmod>2014-06-01</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/01@hd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/01.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/02@hd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/02.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/03@hd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/03.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/04@hd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/04.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/05@hd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/05.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/06@hd.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dudeney-dissection/06.jpg</image:loc>
      <image:title><![CDATA[Dudeny dissection]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Dudeney-dissection@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/dudeney-dissection/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Dudeny dissection]]></video:title>
      <video:description><![CDATA[What is the minimal number of parts an equilateral triangle should be cut into so that a square can be formed rearranging them?]]></video:description>
      <video:duration>76</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/volume-balance/</loc>
    <lastmod>2013-10-26</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/01@hd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/01.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/02@hd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/02.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/03@hd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/03.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/04@hd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/04.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/05@hd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/05.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/06@hd.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/volume-balance/06.jpg</image:loc>
      <image:title><![CDATA[Volumes: Lever scales]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/chasles-theorem/</loc>
    <lastmod>2013-10-25</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/01@hd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/01.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/02@hd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/02.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/03@hd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/03.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/04@hd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/04.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/05@hd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/05.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
    </image:image>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/conic-sections-water/</loc>
    <lastmod>2013-02-19</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/01@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/01.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/02@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/02.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/03@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/03.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/04@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/04.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/05@hd.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-water/05.jpg</image:loc>
      <image:title><![CDATA[Conic sections. A cone with water]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_conic-sections_water@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/conic-sections-water/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Conic sections. A cone with water]]></video:title>
      <video:description><![CDATA[All the conic sections — an ellipse, a parabola and a hyperbola — can be seen on water surface.]]></video:description>
      <video:duration>50</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/exterior-angles-sum/</loc>
    <lastmod>2013-02-17</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/01@hd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/01.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/02@hd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/02.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/03@hd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/03.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/04@hd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/04.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/05@hd.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/exterior-angles-sum/05.jpg</image:loc>
      <image:title><![CDATA[Exterior angles sum of a convex polygon]]></image:title>
    </image:image>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_exterior-angles-sum@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/exterior-angles-sum/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Exterior angles sum of a convex polygon]]></video:title>
      <video:description><![CDATA[The sum of exterior angles of a convex polygon is 360°.]]></video:description>
      <video:duration>62</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/sum-of-squares/</loc>
    <lastmod>2013-02-17</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/01@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/01.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/02@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/02.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/03@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/03.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/04@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/04.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/05@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/05.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/06@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sum-of-squares/06.jpg</image:loc>
      <image:title><![CDATA[Sum of squares]]></image:title>
    </image:image>
    <video:video>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/sum-of-squares/poster-wooden@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sum of squares]]></video:title>
      <video:description><![CDATA[What’s the sum of squares of first n natural numbers?]]></video:description>
      <video:duration>97</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_sum-of-squares_colour@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/sum-of-squares/thumb@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Sum of squares]]></video:title>
      <video:description><![CDATA[What’s the sum of squares of first n natural numbers?]]></video:description>
      <video:duration>106</video:duration>
    </video:video>
  </url>
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    <lastmod>2013-02-15</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/01@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/01.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/02@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/02.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/03@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/04@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/04.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/05.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/06@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/06.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/07@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/07.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/08@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/08@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/08.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/09@fhd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/09@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/10@hd.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-area/10.jpg</image:loc>
      <image:title><![CDATA[Circle area]]></image:title>
    </image:image>
    <video:video>
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      <video:thumbnail_loc>https://en.etudes.ru/.data/models/circle-area/poster-area-circle-to-rectangle@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Circle area]]></video:title>
      <video:description><![CDATA[Calculating the area of a circle using area formulas for a rectangle and a triangle.]]></video:description>
      <video:duration>46</video:duration>
    </video:video>
    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_area-circle-to-triangle@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/circle-area/poster-area-circle-to-triangle@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Circle area]]></video:title>
      <video:description><![CDATA[Calculating the area of a circle using area formulas for a rectangle and a triangle.]]></video:description>
      <video:duration>49</video:duration>
    </video:video>
  </url>
  <url>
    <loc>https://en.etudes.ru/models/steinhaus-dodecahedron/</loc>
    <lastmod>2013-02-13</lastmod>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/01@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/01@hd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/02@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/02@hd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/03@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/03.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/04@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/04@hd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/04.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/05@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/05@hd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/05.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/06@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/06@hd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/06.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/07@fhd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/07@hd.jpg</image:loc>
      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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      <video:title><![CDATA[Steinhaus Dodecahedron]]></video:title>
      <video:description><![CDATA[A cardboard model of a dodecahedron — one of the five regular polyhedra.]]></video:description>
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      <video:title><![CDATA[Steinhaus Dodecahedron]]></video:title>
      <video:description><![CDATA[A cardboard model of a dodecahedron — one of the five regular polyhedra.]]></video:description>
      <video:duration>59</video:duration>
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    <video:video>
      <video:content_loc>https://en.etudes.ru/.data/video/EtudesRu_models_Steinhaus-dodecahedron-Adygea@fhd.mp4</video:content_loc>
      <video:thumbnail_loc>https://en.etudes.ru/.data/models/steinhaus-dodecahedron/poster-Steinhaus-dodecahedron-Adygea@fhd.jpg</video:thumbnail_loc>
      <video:title><![CDATA[Steinhaus Dodecahedron]]></video:title>
      <video:description><![CDATA[A cardboard model of a dodecahedron — one of the five regular polyhedra.]]></video:description>
      <video:duration>41</video:duration>
    </video:video>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/loop-the-loop/thumb.jpg</image:loc>
      <image:title><![CDATA[Мёртвая петля]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Мёртвая петля]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Олоид]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/oloid/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Олоид]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Bernoulli-lemniscate/thumb.jpg</image:loc>
      <image:title><![CDATA[Лемниската Бернулли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Bernoulli-lemniscate/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Лемниската Бернулли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solid-figures-threaded-net/thumb.jpg</image:loc>
      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Стереометрические фигуры: развёртки с ниткой]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square-pendant/thumb.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата: кулон]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square-pendant/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата: кулон]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/thumb.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram-square-circle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия «круг—квадрат»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/magnetic-cannon/thumb.jpg</image:loc>
      <image:title><![CDATA[Магнитная пушка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/magnetic-cannon/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Магнитная пушка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram/thumb.jpg</image:loc>
      <image:title><![CDATA[Амбиграммы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ambigram/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Амбиграммы]]></image:title>
    </image:image>
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      <image:loc>https://en.etudes.ru/.data/models/spherical-triangle-angular-defect/thumb.jpg</image:loc>
      <image:title><![CDATA[Сферический треугольник: угловой дефект]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Сферический треугольник: угловой дефект]]></image:title>
    </image:image>
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      <image:loc>https://en.etudes.ru/.data/models/trefoil-knot-earrings/thumb.jpg</image:loc>
      <image:title><![CDATA[Трилистник: серьги]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/trefoil-knot-earrings/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Трилистник: серьги]]></image:title>
    </image:image>
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      <image:loc>https://en.etudes.ru/.data/models/pseudosphere-constant-negative-curvature/thumb.jpg</image:loc>
      <image:title><![CDATA[Псевдосфера: поверхность постоянной отрицательной кривизны]]></image:title>
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      <image:title><![CDATA[Псевдосфера: поверхность постоянной отрицательной кривизны]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-octagon/thumb.jpg</image:loc>
      <image:title><![CDATA[Квадрат и правильный восьмиугольник]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-octagon/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Квадрат и правильный восьмиугольник]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/t-puzzle/thumb.jpg</image:loc>
      <image:title><![CDATA[T-puzzle]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/t-puzzle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[T-puzzle]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/figura-simmetrica-puzzle/thumb.jpg</image:loc>
      <image:title><![CDATA[Головоломки «Симметричная фигура»]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/figura-simmetrica-puzzle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Головоломки «Симметричная фигура»]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/Chebotaev-wave-pendulum/thumb.jpg</image:loc>
      <image:title><![CDATA[Волновой маятник Чеботаева]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Chebotaev-wave-pendulum/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Волновой маятник Чеботаева]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/solids-of-revolution/thumb.jpg</image:loc>
      <image:title><![CDATA[Тела вращения: конус, цилиндр, шар]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/solids-of-revolution/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Тела вращения: конус, цилиндр, шар]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/science-art-dancing-circles/thumb.jpg</image:loc>
      <image:title><![CDATA[Танцующие окружности]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/science-art-dancing-circles/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Танцующие окружности]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-pendulum/thumb.jpg</image:loc>
      <image:title><![CDATA[Синусоида: колебания маятника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-pendulum/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Синусоида: колебания маятника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/twisted-cubic/thumb.jpg</image:loc>
      <image:title><![CDATA[Скрученная кубика]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/twisted-cubic/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Скрученная кубика]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-net/thumb.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: развёртка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-net/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: развёртка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-paper-folding/thumb.jpg</image:loc>
      <image:title><![CDATA[Эллипс, гипербола, парабола: складывание листа бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-paper-folding/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс, гипербола, парабола: складывание листа бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/puzzle-calendar/thumb.jpg</image:loc>
      <image:title><![CDATA[Календарь-головоломка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/puzzle-calendar/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Календарь-головоломка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbolic-paraboloid-elastic-cord-frame/thumb.jpg</image:loc>
      <image:title><![CDATA[Гиперболический параболоид: рамка с резиновой нитью]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbolic-paraboloid-elastic-cord-frame/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболический параболоид: рамка с резиновой нитью]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/impossible-plate-trick/thumb.jpg</image:loc>
      <image:title><![CDATA[Невозможная пластина: геометрическая головоломка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/impossible-plate-trick/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Невозможная пластина: геометрическая головоломка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses-and-hyperbolas-pendant/thumb.jpg</image:loc>
      <image:title><![CDATA[Софокусные эллипсы и гиперболы: кулон]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-confocal-ellipses-and-hyperbolas-pendant/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Софокусные эллипсы и гиперболы: кулон]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parabola-string-art/thumb.jpg</image:loc>
      <image:title><![CDATA[Парабола: изонить]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parabola-string-art/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Парабола: изонить]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/thumb.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Archimedes-trammel/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипсограф: теорема Коперника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/thumb.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/torus-volume/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Объём тора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/thumb.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-board-models/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: плоские модели]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-cart/thumb.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: тележка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/constant-width-curves-cart/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Постоянная ширина: тележка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/thumb.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circumscribed-circle-paper-model/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Описанная окружность: модель из бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/thumb.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/road-manholes/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Дорожные люки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-set/thumb.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: простейшая модель]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-set/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: простейшая модель]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/thumb.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/parallelogram-area/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь параллелограмма]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/thumb.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rigidity-geometry/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Геометрия неизгибаемости]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rhombohedron/thumb.jpg</image:loc>
      <image:title><![CDATA[Октаэдр и правильные тетраэдры]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/rhombohedron/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Октаэдр и правильные тетраэдры]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Jastrow-illusion/thumb.jpg</image:loc>
      <image:title><![CDATA[Иллюзия размера]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Jastrow-illusion/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Иллюзия размера]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Villarceau-circles/thumb.jpg</image:loc>
      <image:title><![CDATA[Окружности Вилларсо]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Villarceau-circles/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности Вилларсо]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/three-equal-volume-pyramids/thumb.jpg</image:loc>
      <image:title><![CDATA[Три равновеликие пирамиды]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/three-equal-volume-pyramids/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Три равновеликие пирамиды]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-aerator/thumb.jpg</image:loc>
      <image:title><![CDATA[Аэратор: однополостный гиперболоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-aerator/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Аэратор: однополостный гиперболоид]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-pendant-earrings/thumb.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса: подвес и серьги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-pendant-earrings/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса: подвес и серьги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/math-pop-up/thumb.jpg</image:loc>
      <image:title><![CDATA[Math Pop-Up: правильные многогранники]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/math-pop-up/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Math Pop-Up: правильные многогранники]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-linked-hearts/thumb.jpg</image:loc>
      <image:title><![CDATA[Лист Мёбиуса: зацепленные сердца]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-linked-hearts/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Лист Мёбиуса: зацепленные сердца]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/octagon-area/thumb.jpg</image:loc>
      <image:title><![CDATA[Площадь правильного восьмиугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/octagon-area/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь правильного восьмиугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ball-tetrahedron/thumb.jpg</image:loc>
      <image:title><![CDATA[Тетраэдр из шаров]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ball-tetrahedron/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Тетраэдр из шаров]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/regular-polyhedra-shadows/thumb.jpg</image:loc>
      <image:title><![CDATA[Тени правильных многогранников]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/regular-polyhedra-shadows/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Тени правильных многогранников]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/invisible-bodies/thumb.jpg</image:loc>
      <image:title><![CDATA[Невидимые тела]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/invisible-bodies/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Невидимые тела]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Minkowski-lattice/thumb.jpg</image:loc>
      <image:title><![CDATA[Теорема Минковского о выпуклом теле]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Minkowski-lattice/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Теорема Минковского о выпуклом теле]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/into-the-wind/thumb.jpg</image:loc>
      <image:title><![CDATA[Навстречу ветру]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/into-the-wind/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Навстречу ветру]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cross-sections-visualizer/thumb.jpg</image:loc>
      <image:title><![CDATA[Демонстратор сечений]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cross-sections-visualizer/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Демонстратор сечений]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/spheres-closest-packing/thumb.jpg</image:loc>
      <image:title><![CDATA[Плотнейшая упаковка шаров]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/spheres-closest-packing/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Плотнейшая упаковка шаров]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/thumb.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Earth-figure/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Фигура Земли]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/thumb.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Mobius-strip-souvenir/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Лента Мёбиуса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/thumb.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/tetrahedrons-in-dodecahedron/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Тетраэдры в додекаэдре]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/thumb.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/ellipse-and-circle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Эллипс и круг]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/thumb.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/skewed-wheels/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Косые колёса]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/thumb.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/square-in-the-bag/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Головоломка «Квадрат в мешочке»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/thumb.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipse-gears/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Качение эллипсов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Galileo-experiments/thumb.jpg</image:loc>
      <image:title><![CDATA[Эксперименты Галилея]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Galileo-experiments/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Эксперименты Галилея]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/moving-sofa-problem/thumb.jpg</image:loc>
      <image:title><![CDATA[Задача о диване]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/moving-sofa-problem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Задача о диване]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/kaleidoscope-parity/thumb.jpg</image:loc>
      <image:title><![CDATA[Чётность калейдоскопа]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/kaleidoscope-parity/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Чётность калейдоскопа]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/mechanical-rocket/thumb.jpg</image:loc>
      <image:title><![CDATA[Механическая ракета]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/mechanical-rocket/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Механическая ракета]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/three-utilities-problem-mug/thumb.jpg</image:loc>
      <image:title><![CDATA[Домики и колодцы: кружка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/three-utilities-problem-mug/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Домики и колодцы: кружка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/paper-knot/thumb.jpg</image:loc>
      <image:title><![CDATA[Правильный пятиугольник: узел из полоски бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/paper-knot/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Правильный пятиугольник: узел из полоски бумаги]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-3-4-5-triangle/thumb.jpg</image:loc>
      <image:title><![CDATA[Теорема Пифагора: треугольник 3–4–5]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-3-4-5-triangle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Теорема Пифагора: треугольник 3–4–5]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix/thumb.jpg</image:loc>
      <image:title><![CDATA[Образующие гиперболоида]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Образующие гиперболоида]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cardioid-nephroid/thumb.jpg</image:loc>
      <image:title><![CDATA[Кардиоида и нефроида]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cardioid-nephroid/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Кардиоида и нефроида]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-pencil-holder/thumb.jpg</image:loc>
      <image:title><![CDATA[Карандашница]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-pencil-holder/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Карандашница]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-rattle/thumb.jpg</image:loc>
      <image:title><![CDATA[Гиперболоидная трещотка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-rattle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоидная трещотка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-converse-theorem/thumb.jpg</image:loc>
      <image:title><![CDATA[Обратная теорема Пифагора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-converse-theorem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Обратная теорема Пифагора]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/thumb.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/keychain-puzzle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Брелок «Монетка»]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/thumb.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Miura-fold/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Miura fold]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/thumb.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Fibonacci-spiral-tiling/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Замощение и спираль Фибоначчи]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/thumb.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-whirligig/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Гиперболоид: пуговица на верёвочке]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/thumb.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-elliptical-billiard/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Эллиптический бильярд]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/thumb.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/two-piece-tetrahedron/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Половинки тетраэдра]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/thumb.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Вращающийся куб]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/thumb.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Hamiltonian-Eulerian-paths/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Гамильтонов и эйлеров циклы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/thumb.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/prince-Rupert-cube/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Куб принца Руперта]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/truncated-mirror-pyramid/thumb.jpg</image:loc>
      <image:title><![CDATA[Усечённая зеркальная пирамида]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/truncated-mirror-pyramid/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Усечённая зеркальная пирамида]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/thumb.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stair-length/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Длина лестницы]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/thumb.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/universal-plug/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Универсальная пробка]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/thumb.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-assembly-kit/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Конические сечения: модель для сборки]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation-axis/thumb.jpg</image:loc>
      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-rotation-axis/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Оси вращения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave-area/thumb.jpg</image:loc>
      <image:title><![CDATA[Площадь под синусоидой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave-area/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь под синусоидой]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-tiling/thumb.jpg</image:loc>
      <image:title><![CDATA[Теорема Пифагора: мозаика]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-tiling/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Теорема Пифагора: мозаика]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square/thumb.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/squaring-the-square/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Квадрирование квадрата]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/polyhedra-reflection-groups/thumb.jpg</image:loc>
      <image:title><![CDATA[Отражение в правильных многогранниках]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/polyhedra-reflection-groups/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Отражение в правильных многогранниках]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dodecagon-area/thumb.jpg</image:loc>
      <image:title><![CDATA[Площадь правильного двенадцатиугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/dodecagon-area/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Площадь правильного двенадцатиугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-packing/thumb.jpg</image:loc>
      <image:title><![CDATA[Плотнейшая упаковка кругов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/circle-packing/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Плотнейшая упаковка кругов]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Cavalieri-principle/thumb.jpg</image:loc>
      <image:title><![CDATA[Принцип Кавальери]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Cavalieri-principle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Принцип Кавальери]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/thumb.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-angles-rubber-bands/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанные углы: игра с резинками]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/thumb.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-parabolic-mirage/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Мираж]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/thumb.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-ellipsoid-circles/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Окружности на эллипсоиде]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/harmonic-series/thumb.jpg</image:loc>
      <image:title><![CDATA[Harmonic series]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/harmonic-series/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Harmonic series]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/thumb.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/partition-into-trapezoids/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Разбиение на трапеции]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/thumb.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/triangle-sum-of-angles/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Сумма внутренних углов треугольника]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/thumb.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperboloid-generatix-rotation/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperboloid generatix rotation]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/thumb.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-earrings/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean theorem: earrings]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/thumb.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/Riemann-integral/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Интеграл Римана]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/thumb.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sieve-of-eratosthenes/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Решето Эратосфена]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-circle-top/thumb.jpg</image:loc>
      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/inscribed-circle-top/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Вписанная окружность: волчок]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/thumb.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/number-cubes/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Number cubes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/thumb.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-capacity/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Cube capacity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/thumb.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/pythagorean-theorem-sand-proof/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Pythagorean Theorem: illustration with sand]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/binary-magic/thumb.jpg</image:loc>
      <image:title><![CDATA[Binary magic]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/binary-magic/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Binary magic]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/thumb.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/fibonacci-numbers-missing-square-puzzle/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Vanishing cell and the Fibonacci numbers]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/thumb.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/cube-cross-sections/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Сечения куба]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/thumb.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/stereographic-projection/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Stereographic projection]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/thumb.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/geometric-progression-sum/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Sum of an infinite geometric progression]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/thumb.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/conic-sections-hyperbola-surface-tension/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbole: the surface tension of water]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/thumb.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/models/sine-wave/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Sine wave: cylinder net]]></image:title>
    </image:image>
    <image:image>
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      <image:title><![CDATA[Corner reflector]]></image:title>
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    <image:image>
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      <image:title><![CDATA[Corner reflector]]></image:title>
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      <image:title><![CDATA[Conic sections: moiré]]></image:title>
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      <image:title><![CDATA[Conic sections: moiré]]></image:title>
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      <image:title><![CDATA[Падение по параболе]]></image:title>
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      <image:title><![CDATA[Падение по параболе]]></image:title>
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      <image:title><![CDATA[Parabola: optical property]]></image:title>
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      <image:title><![CDATA[Parabola: optical property]]></image:title>
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      <image:title><![CDATA[Parabolic billiard]]></image:title>
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      <image:title><![CDATA[Chips: hyperbolic paraboloid]]></image:title>
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      <image:title><![CDATA[Number π]]></image:title>
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      <image:title><![CDATA[Number π]]></image:title>
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      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
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      <image:title><![CDATA[Plotting a parabola. Geometric definition]]></image:title>
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      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
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      <image:title><![CDATA[Cavalieri’s parabolograph]]></image:title>
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      <image:title><![CDATA[Trapezoid area]]></image:title>
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      <image:title><![CDATA[Trapezoid area]]></image:title>
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      <image:title><![CDATA[Dudeny dissection]]></image:title>
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      <image:title><![CDATA[Dudeny dissection]]></image:title>
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      <image:title><![CDATA[Chasles’ theorem]]></image:title>
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      <image:loc>https://en.etudes.ru/.data/models/chasles-theorem/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Chasles’ theorem]]></image:title>
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      <image:title><![CDATA[Sum of squares]]></image:title>
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      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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      <image:title><![CDATA[Steinhaus Dodecahedron]]></image:title>
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      <image:title><![CDATA[Szilassi polyhedron]]></image:title>
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      <image:title><![CDATA[Walking tours]]></image:title>
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      <image:title><![CDATA[Odd numbers sum]]></image:title>
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      <image:title><![CDATA[Pythagorean triangle]]></image:title>
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    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/tetrahedron-altitude/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Tetrahedron altitudes]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/two-circles-paradox/thumb.jpg</image:loc>
      <image:title><![CDATA[Two circles]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/two-circles-paradox/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Two circles]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/reuleaux-triangle-rotor/thumb.jpg</image:loc>
      <image:title><![CDATA[Rotor]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/reuleaux-triangle-rotor/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Rotor]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/polyhedrons-duality/thumb.jpg</image:loc>
      <image:title><![CDATA[Duality of regular polyhedrons]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/polyhedrons-duality/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Duality of regular polyhedrons]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/hyperbola-ellipse-perpendicularity/thumb.jpg</image:loc>
      <image:title><![CDATA[Hyperbola and ellipse perpendicularity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/hyperbola-ellipse-perpendicularity/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbola and ellipse perpendicularity]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/room-illumination/thumb.jpg</image:loc>
      <image:title><![CDATA[Room illumination]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/room-illumination/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Room illumination]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/hyperbola-envelope/thumb.jpg</image:loc>
      <image:title><![CDATA[Hyperbola as an envelope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/hyperbola-envelope/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Hyperbola as an envelope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/ellipse-envelope/thumb.jpg</image:loc>
      <image:title><![CDATA[Ellipse as an envelope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/ellipse-envelope/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Ellipse as an envelope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/parabola-envelope/thumb.jpg</image:loc>
      <image:title><![CDATA[Parabola as an envelope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/parabola-envelope/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Parabola as an envelope]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/parabola-optic-property/thumb.jpg</image:loc>
      <image:title><![CDATA[Parabola optical property]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/parabola-optic-property/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Parabola optical property]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/ellipse-optic-property/thumb.jpg</image:loc>
      <image:title><![CDATA[Ellipsis optical property]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/ellipse-optic-property/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Ellipsis optical property]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/timber-rafting/thumb.jpg</image:loc>
      <image:title><![CDATA[Timber rafting]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/timber-rafting/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Timber rafting]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/astroid/thumb.jpg</image:loc>
      <image:title><![CDATA[Astroid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/astroid/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Astroid]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/cat-on-ladder/thumb.jpg</image:loc>
      <image:title><![CDATA[Cat on a ladder]]></image:title>
    </image:image>
    <image:image>
      <image:loc>https://en.etudes.ru/.data/sketches/cat-on-ladder/thumb@hd.jpg</image:loc>
      <image:title><![CDATA[Cat on a ladder]]></image:title>
    </image:image>
  </url>
</urlset>
