Question: when does the tournament of power arc start
[{'answer': '97', 'provenance': [{'wikipedia_id': '49208411', 'title': 'List of Dragon Ball Super episodes', 'start_paragraph_id': 2, 'start_character': 1221, 'end_paragraph_id': 2, 'end_character': 1223, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]