Question: how many yards is a block in the back penalty
[{'answer': '10 yards', 'provenance': [{'wikipedia_id': '21274733', 'title': 'Penalty (gridiron football)', 'start_paragraph_id': 4, 'start_character': 231, 'end_paragraph_id': 4, 'end_character': 239, 'bleu_score': 1.0, 'section': 'Section::::Rationale.\n'}]}]