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Language/Type: Python set collections

Write a function named twice that accepts as a parameter a list of integers and returns a set containing all the numbers in the list that appear exactly twice. For example, if a list variable v stores {1, 3, 1, 4, 3, 7, -2, 0, 7, -2, -2, 1}, the call of twice(v) should return the set {3, 7}.

If you want an extra challenge: Use only sets as auxiliary storage.

Function: Write a Python function as described, not a complete program.

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