Question: how many locks in the caen hill flight
[{'answer': '29', 'provenance': [{'wikipedia_id': '7046787', 'title': 'Caen Hill Locks', 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7046787', 'title': 'Caen Hill Locks', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 604, 'bleu_score': 0.9297137846207301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12174714052977487060}, 'section': 'Section::::Description.\n'}]}]