Question: A substring of some character string is a contiguous sequence of characters in that string (which is different than a subsequence, of course). Suppose you

A substring of some character string is a contiguous sequence of characters in that string (which is different than a subsequence, of course). Suppose you are given two character strings, X and Y , with respective lengths n and m. Describe an efficient algorithm for finding a longest common substring of X and Y .

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