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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 addDataset(self, dataset):
 """ Adds the specified dataset to this data repository. """

        id_ = dataset.getId()
        self._datasetIdMap[id_] = dataset
        self._datasetNameMap[dataset.getLocalId()] = dataset
        self._datasetIds.append(id_)