def build_tac_env_variables(tournament_id: str, version_id: str, seed: int) -> str:
    """
    Return a sequence of 'VARIABLE_1=VALUE_1 VARIABLE_2=VALUE_2 ...'.

    :param tournament_id: the id of the tournament
    :param version_id: the id of the experiment
    :param seed: the seed for the random module
    :return: a string encapsulating the params
    """
    return "DATA_OUTPUT_DIR={} VERSION_ID={} SEED={}".format(
        tournament_id, version_id, seed
    )