1
var countVowels = function (word) {
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  const vowels = new Set(["a", "e", "i", "o", "u"]);
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  let total = 0;
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  let count = 0;
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  for (let i = 0; i < word.length; i++) {
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    if (vowels.has(word[i])) {
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      count += i + 1;
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    }
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    total += count;
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  }
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  return total;
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};