Graph
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Proof 3-6Sat, 10 Nov 2012 14:50:42 -0500, by Steve Losh
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Proof 0-2Sat, 10 Nov 2012 14:21:55 -0500, by Steve Losh
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Tweaks.Sat, 10 Nov 2012 13:45:43 -0500, by Steve Losh
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Formatting.Tue, 06 Nov 2012 17:59:25 -0500, by Steve Losh