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when toggle format what by license comment
Apr 5, 2016 at 18:17 comment added Fedor Petrov I wonder myself.
Apr 5, 2016 at 18:16 comment added Dominic van der Zypen Thanks Fedor--is there a variant of this lemma for directed graphs?
Apr 4, 2016 at 7:36 vote accept Dominic van der Zypen
Apr 4, 2016 at 7:23 history answered Fedor Petrov CC BY-SA 3.0