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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 addRnaQuantification(self, rnaQuantification):
 """ Add an rnaQuantification to this rnaQuantificationSet """

        id_ = rnaQuantification.getId()
        self._rnaQuantificationIdMap[id_] = rnaQuantification
        self._rnaQuantificationIds.append(id_)