Question: how many episodes of 13 reasons why season 2 have aired
[{'answer': '13', 'provenance': [{'wikipedia_id': '25247887', 'title': '13 Reasons Why', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 2, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]