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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_unqualified_edge(self, source: Node, target: Node, key: str, bel: str, data: EdgeData) -> Edge: """Add an unqualified edge to the network."""

        return self.get_or_create_edge(
            source=source,
            target=target,
            relation=data[RELATION],
            bel=bel,
            sha512=key,
            data=data,
        )