Question: where is the tv series once upon a time filmed
[{'answer': 'Vancouver , British Columbia', 'provenance': [{'wikipedia_id': '4704229', 'title': 'Once Upon a Time (TV series)', 'start_paragraph_id': 67, 'start_character': 52, 'end_paragraph_id': 67, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Development and production.:Filming.\n'}]}, {'provenance': [{'wikipedia_id': '4704229', 'title': 'Once Upon a Time (TV series)', 'start_paragraph_id': 67, 'start_character': 0, 'end_paragraph_id': 67, 'end_character': 538, 'bleu_score': 0.9165786837270161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9043027706793921676}, 'section': 'Section::::Development and production.:Filming.\n'}]}]