Question: who was nottingham forest manager when they won back to back european cups
[{'answer': 'Brian Clough', 'provenance': [{'wikipedia_id': '157294', 'title': 'Nottingham Forest F.C.', 'start_paragraph_id': 2, 'start_character': 194, 'end_paragraph_id': 2, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Peter Taylor', 'provenance': [{'wikipedia_id': '157294', 'title': 'Nottingham Forest F.C.', 'start_paragraph_id': 2, 'start_character': 211, 'end_paragraph_id': 2, 'end_character': 223, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]