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def search4vowels(phrase: str) -> set:
"""Return any vowels found in a supplied phrase."""
vowels = set('aeiou')
return vowels.intersection(set(phrase))
def search4letters(phrase: str, letters: str='aeiou') -> set:
"""Return a set of the 'letters' found in 'phrase'."""
return set(letters).intersection(set(phrase))
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