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Feb 8, 2012 at 13:15 vote accept Freeman
Feb 8, 2012 at 13:14 vote accept Freeman
Feb 8, 2012 at 13:14
Jan 23, 2012 at 11:16 history migrated from math.stackexchange.com (revisions)
Jan 22, 2012 at 16:40 history answered Raymond Manzoni CC BY-SA 3.0