(rounds_1, rounds_2)
:param rounds_1: list - first rounds played.
    :param rounds_2: list - second set of rounds played.
    :return: list - all rounds played.
def concatenate_rounds(rounds_1, rounds_2):
    """

    :param rounds_1: list - first rounds played.
    :param rounds_2: list - second set of rounds played.
    :return: list - all rounds played.
    """

    pass
def concatenate_rounds ( rounds_1 , rounds_2 ) : pass