Tracy's submissions for 1197 倒杨辉三角形

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Tracy
on Oct. 20, 2011, 6:36 p.m.
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Tracy
on Oct. 20, 2011, 6:32 p.m.
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164.00 KB
Tracy
on Oct. 20, 2011, 6:31 p.m.
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164.00 KB
Tracy
on Oct. 20, 2011, 6:30 p.m.
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164.00 KB