Question: You are given an array S consisting of N strings. Every string is of the same length M . Your task is to find a

You are given an array S consisting of N strings. Every string is of the same length M.
Your task is to find a pair of strings in array S, such that there exists a position in which both of the strings have the same letter.
Both the index in arrays S and the positions in the strings are numbered from zero.

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