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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 allVariantAnnotationSets(self):
 """ Return an iterator over all variant annotation sets in the data repo """

        for dataset in self.getDatasets():
            for variantSet in dataset.getVariantSets():
                for vaSet in variantSet.getVariantAnnotationSets():
                    yield vaSet