Question: when did they start filming the first harry potter movie
[{'answer': 'September 2000', 'provenance': [{'wikipedia_id': '7629286', 'title': 'Harry Potter (film series)', 'start_paragraph_id': 18, 'start_character': 77, 'end_paragraph_id': 18, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}, {'provenance': [{'wikipedia_id': '7629286', 'title': 'Harry Potter (film series)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 346, 'bleu_score': 0.9196822664155291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8168424455790851075}, 'section': 'Section::::Production.\n'}]}]