Question: Problem 3 [5pt] Write a function flatten which takes a list (which may contain other lists) and returns a single list containing the elements of

Problem 3 [5pt] Write a function flatten which takes a list

Problem 3 [5pt] Write a function flatten which takes a list (which may contain other lists) and returns a single list containing the elements of all of the lists. For example, (flatten '(1 (2) (2 3)) should return (1 2 2 3), and (flatten '(1 (2) (3 (4) should return (12 34)

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