Question: how many episodes in series 4 of the 100
[{'answer': '13', 'provenance': [{'wikipedia_id': '42541865', 'title': 'List of The 100 episodes', 'start_paragraph_id': 1, 'start_character': 213, 'end_paragraph_id': 1, 'end_character': 215, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]