Question: when did congress outlaw literacy tests altogether as a prerequisite to voter registration
[{'answer': '1970', 'provenance': [{'wikipedia_id': '667884', 'title': 'Literacy test', 'start_paragraph_id': 6, 'start_character': 245, 'end_paragraph_id': 6, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Voting.\n'}]}, {'provenance': [{'wikipedia_id': '667884', 'title': 'Literacy test', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 572, 'bleu_score': 0.979896933041101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2173136651698009605}, 'section': 'Section::::Voting.\n'}]}]