Question: when did the battle of waterloo start and end
[{'answer': '18 June 1815', 'provenance': [{'wikipedia_id': '4356', 'title': 'Battle of Waterloo', 'start_paragraph_id': 1, 'start_character': 45, 'end_paragraph_id': 1, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4356', 'title': 'Battle of Waterloo', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 0.7600682170042421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4696397134980941529}, 'section': 'Section::::Abstract.'}]}]