Milestone 2 (34 points) - University of Illinois Urbana-Champaign

substring. A substring is a contiguous sequence of characters within a string. A common substring is a substring of every element in the given list of DNA strings. Note that the number of DNA strings in the input list is not always the same! There may be multiple solutions, but you only need to return the first one. E x a m p l e : ................
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