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https://zoeanastassiou.wordpress.com/2016/05/29/you-compete-me-365-%e2%80%8emost-alternating-bounces-of-ping-pong-ball-on-two-paddles-in-30-seconds/
YOU COMPETE ME 365: ‚Äémost alternating bounces of ping pong ball on two paddles in 30 seconds