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第一行给的是P,T数,不是第三个人听到第四棵树In Reply To:麻烦解释下可以么？？ Posted by:onon at 2006-08-27 16:21:59 > 第一个人听到的树｛２，３｝ > 第二个人听到的树｛２，４｝ > 第三个人听到的树｛２，３，４｝ > why two!!! Followed by:
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