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如果一个环A包含另一个环B,B还算不算?

Posted by Mithril at 2006-10-21 14:34:47
In Reply To:Travel的unique是怎么定义的? Posted by:zhuzeyuan at 2006-10-21 14:30:24
> 题目说的含糊不清啊,sample为什么有3个?

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