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Re:为什么SAMPLE是4???

Posted by 547880119 at 2009-02-24 19:49:05 on Problem 1836
In Reply To:为什么SAMPLE是4??? Posted by:deathado at 2008-05-13 11:03:49
> 第二个人可以看见左端,第三个人要出,第四个人可以看见两端,第五第六个人要出,第七可以看见右端,一共才三个人啊?
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