For help, c #, the existing with A1, A2, B1, B2 in this type of an array of strings, a total of 60 array elements is known, will now extract from 8 or 9 elements, please input element in the array may have to cite all of the following does not repeat the result,

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https://bbs.csdn.net/topics/390550326

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If for loop or algorithm and the judgment,