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两个棋子有差别吗？

Posted by alpc02 at 2006-09-19 19:14:24 on Problem 2990
In Reply To:请问这个题怎么做啊 Posted by:confirm at 2006-09-19 01:06:18 
> 我感觉要建一个图，然后就不知道怎么做了,谢谢
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