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Jan 19, 2017 at 21:46 history edited David Handelman CC BY-SA 3.0
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Jan 19, 2017 at 14:32 comment added Joseph O'Rourke See also: "Ping-pong progress through a quincunx."
S Jan 19, 2017 at 14:03 history answered David Handelman CC BY-SA 3.0
S Jan 19, 2017 at 14:03 history made wiki Post Made Community Wiki by David Handelman