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Language/Type: Python parameters print return

What output is produced by the following program?

def mystery(z, x, y):
    z -= 1
    x = 2 * y + z
    y = x - 1
    print(y, z)
    return x

def main():
    x = 1
    y = 2
    z = 3
    z = mystery(x, z, y)
    print(x, y, z)
    x = mystery(z, z, x)
    print(x, y, z)
    y = mystery(y, y, z)
    print(x, y, z)

line 1
line 2
line 3
line 4
line 5
line 6

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