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答案应该不唯一吧．

Posted by rushAC at 2007-08-25 15:21:17 on Problem 3355 
对于样例：(-2,1) (-1,-2) (-1,1) (-1,2) (-1,3) (0,0) (1,-1) (1,1) (2,-2) (2,1) (3,2)
(-2,1) (-1,-2) (2,1) (3,2) (-1,3) (-2,1)
应该也可以吧．
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