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2ES5K - YouTube
https://www.youtube.com/watch?v=z7FWDhpdnkU
2ES5K locomotive Promotional video from tmholding.ru
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Dehn Twist 2 - YouTube
https://www.youtube.com/watch?v=7yYVk4YvHc4
This movie shows how we can change the meridian to the longitude on a torus by applying two Dehn twists. Dehn twists generate the mapping class group of the ...