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不知道这样的数据是否合法，如果合法，输出6才对啊！

Posted by mengxiang000 at 2016-06-25 19:05:37 on Problem 1129 and last updated at 2016-06-25 19:06:15 
6
A:BCDEF
B:ACDEF
C:ABDEF
D:ABCEF
E:ABCDF
F:ABCDE
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