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Nov 2, 2014 at 8:50 vote accept skew41
Nov 2, 2014 at 0:48 answer added Benjamin Steinberg timeline score: 2
Nov 1, 2014 at 13:17 history edited skew41 CC BY-SA 3.0
added an explanation why the questions have positive answers in the group case
Nov 1, 2014 at 11:56 history asked skew41 CC BY-SA 3.0