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Apr 18, 2013 at 21:26 comment added Ollie Still, this is a neat proof, so I have accepted it.
Apr 18, 2013 at 21:24 vote accept Ollie
Apr 18, 2013 at 7:21 comment added Makoto Yamashita sorry, I was overlooking Alain's comment which was folded. This is the same argument as his.
Apr 18, 2013 at 7:20 history answered Makoto Yamashita CC BY-SA 3.0