沉沉's submissions for 1175 等比数列

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沉沉
on July 15, 2008, 9:14 p.m.
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沉沉
on July 15, 2008, 9:12 p.m.
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152.00 KB
沉沉
on July 15, 2008, 9:12 p.m.
0.00s
152.00 KB