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2011-09-14 12:28:00
+15   Benchong voted up your answer in which you said: "N=1 2(1) -7 = - 5 ..."
2011-09-14 01:44:53
+15   Daisy! voted up your answer in which you said: "N=1 2(1) -7 = - 5 ..."

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