Question: who said you cannot step into the same river twice
[{'answer': 'Heraclitus', 'provenance': [{'wikipedia_id': '13792', 'title': 'Heraclitus', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13792', 'title': 'Heraclitus', 'start_paragraph_id': 2, 'start_character': 679, 'end_paragraph_id': 2, 'end_character': 1450, 'bleu_score': 0.6839303592386461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13973503325423033418}, 'section': 'Section::::Abstract.'}]}]