Graph

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Proof 27-31.
Wed, 03 Apr 2013 21:57:57 -0400, by Steve Losh
Proof 19-26.
Wed, 03 Apr 2013 21:53:35 -0400, by Steve Losh

less more | at revision 190: (0) -100 -30 -10 -2 +2 +10 +30 tip