winter's submissions for 1042 求等差数列的和

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winter
on Feb. 18, 2008, 1:23 p.m.
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winter
on Feb. 18, 2008, 1:11 p.m.
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winter
on Feb. 18, 2008, 1:09 p.m.
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winter
on Feb. 18, 2008, 1:08 p.m.
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