def argument_to_string(token, edge_name):
    """
    Converts the argument token (X or Y) to an edge string representation
    :param token: the X or Y token
    :param edge_name: 'X' or 'Y'
    :return:
    """
    return '/'.join([edge_name, token.pos_, token.dep_ if token.dep_ != '' else 'ROOT'])