Question: how many parts are there in harry potter series
[{'answer': 'eight', 'provenance': [{'wikipedia_id': '7629286', 'title': 'Harry Potter (film series)', 'start_paragraph_id': 1, 'start_character': 160, 'end_paragraph_id': 1, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7629286', 'title': 'Harry Potter (film series)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 511, 'bleu_score': 0.8537376411238151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11510971227009045990}, 'section': 'Section::::Abstract.'}]}]