1178. Number of Valid Words for Each Puzzle

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With respect to a given puzzle string, a word is valid if both the following conditions are satisfied: - word contains the first letter of puzzle. - For each letter in word, that letter is in puzzle. - For example, if the puzzle is "abcdefg", then valid words are "faced", "cabbage", and "baggage", while - invalid words are "beefed" (does not include 'a') and "based" (includes 's' which is not

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