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Language/Type: Python loops

Given the following function, write the value returned by each of the following calls.

def mystery(x, y):
    while x != 0 and y != 0:
        if x < y:
            y -= x
            x -= y
    return x + y
mystery(3, 3)
mystery(5, 3)
mystery(2, 6)
mystery(12, 18)
mystery(30, 75)

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