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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 addReadGroupSet(self, readGroupSet):
 """ Adds the specified readGroupSet to this dataset. """

        id_ = readGroupSet.getId()
        self._readGroupSetIdMap[id_] = readGroupSet
        self._readGroupSetNameMap[readGroupSet.getLocalId()] = readGroupSet
        self._readGroupSetIds.append(id_)