Question: how many dark nights metal comics are there
[{'answer': '6', 'provenance': [{'wikipedia_id': '55412860', 'title': 'Dark Nights: Metal', 'start_paragraph_id': 6, 'start_character': 119, 'end_paragraph_id': 6, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Publication history.\n'}]}]