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求一组数据的解释

Posted by visual at 2013-03-06 21:45:38 on Problem 1753 
如果输入如下：
wwww
wwww
wwbb
wwbb
那不是只要翻转最右下角一个即可？ 但用AC的代码输出是 impossible， 难道我对题目理解错呢?
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