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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_translation(self, rna: Rna, protein: Protein) -> str: """Add a translation relation from a RNA to a protein. :param rna: An RNA node :param protein: A protein node """

        return self.add_unqualified_edge(rna, protein, TRANSLATED_TO)