Question: who invented the first down line on tv
[{'answer': 'David W. Crain', 'provenance': [{'wikipedia_id': '4035893', 'title': '1st & Ten (graphics system)', 'start_paragraph_id': 6, 'start_character': 125, 'end_paragraph_id': 6, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Conception.\n'}]}, {'provenance': [{'wikipedia_id': '4035893', 'title': '1st & Ten (graphics system)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 346, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6896432719837982297}, 'section': 'Section::::Conception.\n'}]}]