def conjoin_args(args):
    """ Conjoin from left to right.

    Args:
        args (list): [<something> CONJUNCTION] <something>

    Returns:
        dict: MongoDB filter
    """
    if len(args) == 1:
        return args[0]
    conj = f"${args[1].value.lower()}"
    return {conj: [args[0], args[2]]}