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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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