Question: how many episodes in the killing season 2
[{'answer': '13', 'provenance': [{'wikipedia_id': '35186026', 'title': 'The Killing (season 2)', 'start_paragraph_id': 1, 'start_character': 155, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35186026', 'title': 'The Killing (season 2)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 565, 'bleu_score': 0.977897140678983, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13289189377786383735}, 'section': 'Section::::Abstract.'}]}]