def handle_unqualified_relation(self, _, __, tokens: ParseResults) -> ParseResults:
        """Handle unqualified relations."""
        subject_node_dsl = self.ensure_node(tokens[SUBJECT])
        object_node_dsl = self.ensure_node(tokens[OBJECT])
        relation = tokens[RELATION]
        self.graph.add_unqualified_edge(subject_node_dsl, object_node_dsl, relation)
        return tokens
Handle unqualified relations.