Question: how many nightmare on elm st movies are there
[{'answer': 'nine', 'provenance': [{'wikipedia_id': '296558', 'title': 'A Nightmare on Elm Street (franchise)', 'start_paragraph_id': 1, 'start_character': 75, 'end_paragraph_id': 1, 'end_character': 79, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '296558', 'title': 'A Nightmare on Elm Street (franchise)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 725, 'bleu_score': 0.667243958197785, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16640979373416583699}, 'section': 'Section::::Abstract.'}]}]