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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 _add_two_way_unqualified_edge(self, u: BaseEntity, v: BaseEntity, relation: str) -> str: """Add an unqualified edge both ways."""

        self.add_unqualified_edge(v, u, relation)
        return self.add_unqualified_edge(u, v, relation)