Question: how many episodes are in season 6 of once upon a time
[{'answer': '22', 'provenance': [{'wikipedia_id': '49666317', 'title': 'Once Upon a Time (season 6)', 'start_paragraph_id': 96, 'start_character': 204, 'end_paragraph_id': 96, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Production.:Development.\n'}]}]