Question: how many episodes in season 7 of sons of anarchy are there
[{'answer': '13', 'provenance': [{'wikipedia_id': '41563719', 'title': 'Sons of Anarchy (season 7)', 'start_paragraph_id': 1, 'start_character': 159, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]