ero's submissions for 1189 杨辉三角形

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ero
on Nov. 2, 2007, 11:35 a.m.
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ero
on Nov. 2, 2007, 11:32 a.m.
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ero
on Nov. 2, 2007, 11:28 a.m.
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ero
on Nov. 2, 2007, 11:28 a.m.
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