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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 addReferenceSet(self, referenceSet):
 """ Adds the specified reference set to this data repository. """

        id_ = referenceSet.getId()
        self._referenceSetIdMap[id_] = referenceSet
        self._referenceSetNameMap[referenceSet.getLocalId()] = referenceSet
        self._referenceSetIds.append(id_)