unordered_set<char> vowels = {'a', 'e', 'i', 'o', 'u'};
    int count = 0;

    for (int i = 0; i + 2 < text.length(); ++i) {
        int vowelCount = 0;

        for (int j = i; j < i + 3; ++j) {
            if (vowels.count(text[j])) {
                vowelCount++;
            }
        }

        if (vowelCount == 2) {
            count++;
        }
    }

    return count;
}