Envelope for 14 Feb v3

Instructions

Points on the circle are labelled 1, 2, ..., N, where N is an even integer. Join the points 1 to 2, 2 to 4, 3 to 6, ..., N/2 to N, N/2+1 to 2, N/2+2 to 4, ..., N-2 to N-1. Happy Valentine's day!

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