Question: how many episodes in star wars rebels season 4
[{'answer': '16', 'provenance': [{'wikipedia_id': '48216840', 'title': 'List of Star Wars Rebels episodes', 'start_paragraph_id': 2, 'start_character': 347, 'end_paragraph_id': 2, 'end_character': 349, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]