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这是题目条件，不用想那么多。

Posted by hawk at 2004-12-17 15:46:44 on Problem 2128
In Reply To:Re:问个弱弱的问题：为什么“ building just one highway would not be enough for that”？ Posted by:seol at 2004-12-17 14:07:26 
可能仅仅是从方便用户来说。
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