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dec 10 at 3:02Is it NP-hard to play international draughts correctly?
may 25 '12 at 14:20Detecting two kinds of almost-simple polygons
jan 10 '12 at 12:38How hard is unshuffling a string?
jan 10 '12 at 12:38Positive topological ordering, take 2
oct 19 '10 at 21:53Positive topological ordering