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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 search_variant_annotation_sets(self, variant_set_id):
 """ Returns an iterator over the Annotation Sets fulfilling the specified conditions from the specified variant set. :param str variant_set_id: The ID of the :class:`ga4gh.protocol.VariantSet` of interest. :return: An iterator over the :class:`ga4gh.protocol.AnnotationSet` objects defined by the query parameters. """

        request = protocol.SearchVariantAnnotationSetsRequest()
        request.variant_set_id = variant_set_id
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "variantannotationsets",
            protocol.SearchVariantAnnotationSetsResponse)