Question: n 2013 the supreme court struck down which part of the 1965 voting rights act
[{'answer': 'Section 4 ( b )'}, {'provenance': [{'wikipedia_id': '37593868', 'title': 'Shelby County v. Holder', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 494, 'bleu_score': 0.8405491156872501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2831618505086509338}, 'section': 'Section::::Abstract.'}]}]