Graph

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Minor refactorings suggested by Gery Debongnie.
Sat, 13 Oct 2012 14:55:32 -0400, by Steve Losh
Add region mapping.
Sat, 01 Sep 2012 23:18:31 -0400, by Steve Losh

less more | at revision 48: (0) -30 -10 -2 +2 tip