's submissions for 1174 1!到n!的和

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on Jan. 14, 2012, 10:18 a.m.
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on Jan. 14, 2012, 10:16 a.m.
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on Jan. 14, 2012, 10:15 a.m.
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164.00 KB

on Jan. 14, 2012, 10:12 a.m.
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164.00 KB