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A comment on The “Windmill” Problem on the 2011 International Mathematical Olympiad [video]. Parent comment

Re:The “Windmill” Problem on the 2011 International Mathemat... by ufo on Thursday October 17, 2019 @07:44PM (#21287376)
The start of the video is talks about the problem and illustrates some concrete examples. At 6:50 it starts the solution, by presenting a key invariant.
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