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我听说了一些规律：成对出现，后手必胜；不成对，堆数为奇数，可一步变为成对，先手必胜。但是我想不通：不成对，堆数为偶数，怎么办？

Posted by ImLazy at 2008-07-11 13:27:56 on Problem 1740 
比如 1、2、3、4、5，我可以变成 2、2、4、4。
但是 1、2、3、4、5、6，我就不知道怎么变了。
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