Question: how many sword art online games are there
[{'answer': 'Six', 'provenance': [{'wikipedia_id': '33270508', 'title': 'Sword Art Online', 'start_paragraph_id': 1, 'start_character': 735, 'end_paragraph_id': 1, 'end_character': 738, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33270508', 'title': 'Sword Art Online', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 811, 'bleu_score': 0.8899258569811611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4295277210776302562}, 'section': 'Section::::Abstract.'}]}]