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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 addVariantAnnotationSet(self, variantAnnotationSet):
 """ Adds the specified variantAnnotationSet to this dataset. """

        id_ = variantAnnotationSet.getId()
        self._variantAnnotationSetIdMap[id_] = variantAnnotationSet
        self._variantAnnotationSetIds.append(id_)