Graph

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Proof 52-56.
Wed, 03 Apr 2013 22:49:39 -0400, by Steve Losh
Proof 49-51.
Wed, 03 Apr 2013 22:37:59 -0400, by Steve Losh
Proof 42-48.
Wed, 03 Apr 2013 22:29:26 -0400, by Steve Losh

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