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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def EXCHANGE(classical_reg1, classical_reg2):
 """ Produce an EXCHANGE instruction. :param classical_reg1: The first classical register, which gets modified. :param classical_reg2: The second classical register, which gets modified. :return: A ClassicalExchange instance. """

    left = unpack_classical_reg(classical_reg1)
    right = unpack_classical_reg(classical_reg2)
    return ClassicalExchange(left, right)