1
class Solution:
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    def countVowels(self, word: str) -> int:
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        count = vowelIndexSum = 0
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        vowels = {"a", "e", "i", "o", "u"}
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        for i, c in enumerate(word, start=1):
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            if c in vowels:
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                vowelIndexSum += i
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            count += vowelIndexSum
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        return count