Question: who did manchester united play before the munich air disaster
[{'answer': 'Red Star Belgrade', 'provenance': [{'wikipedia_id': '157511', 'title': 'Munich air disaster', 'start_paragraph_id': 2, 'start_character': 92, 'end_paragraph_id': 2, 'end_character': 109, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '157511', 'title': 'Munich air disaster', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 655, 'bleu_score': 0.9243004410966761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15343529490353174010}, 'section': 'Section::::Background.\n'}]}]