Question: Solve in Python 3: Implement function four_letter() that takes as input a list of words (i.e., strings) and returns the sublist of all four letter

Solve in Python 3: Implement function four_letter() that takes as input a list of words (i.e., strings) and returns the sublist of all four letter words in the list.

>>> four_letter(['dog', 'letter', 'stop', 'door', 'bus', 'dust'])

['stop', 'door', 'dust']

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