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please help my poor english

Posted by zfy0701 at 2008-09-01 19:25:25 on Problem 2989
 A set of friends S is maximal if every person that does not belong to S is not a friend with someone in S. 

这话到底咋理解?是任何人都不能和这个set中的任何人有关系么?
感觉直观的理解会和样例有冲突啊

这题是不是求极大完全子图的数量?

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