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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 list_equivalencies(self):
 """Lists the possible equivalencies associated with this unit object Examples -------- spectral: length <-> spatial_frequency <-> frequency <-> energy schwarzschild: mass <-> length compton: mass <-> length """

        from unyt.equivalencies import equivalence_registry

        for k, v in equivalence_registry.items():
            if self.has_equivalent(k):
                print(v())