1915. Number of Wonderful Substrings

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A wonderful string is a string where at most one letter appears an odd number of times. - For example, "ccjjc" and "abab" are wonderful, but "ab" is not. Given a string word that consists of the first ten lowercase English letters ('a' through 'j'), return the number of wonderful non-empty substrings in word. If the same substring appears multiple times in word, then count each occurrence se

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