kinematics
https://www.youtube.com/watch?v=32b2c2Fxtrs& list=PLL9xAkze-jUUm6slrr-KEPJBVIuQb-cWt&index=38
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https://www.youtube.com/watch?v=32b2c2Fxtrs& list=PLL9xAkze-jUUm6slrr-KEPJBVIuQb-cWt&index=38