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when toggle format what by license comment
May 12, 2011 at 15:56 comment added David E Speyer This doesn't work (although I have fallen into this trap many times myself.) Look at the Catalan path UURURR. It cannot occur in this manner. You have only given an injection to ballot paths.
May 12, 2011 at 15:34 history answered Aaron Meyerowitz CC BY-SA 3.0