Question: how many episodes are there of one strange rock
[{'answer': '10', 'provenance': [{'wikipedia_id': '56581378', 'title': 'One Strange Rock', 'start_paragraph_id': 3, 'start_character': 177, 'end_paragraph_id': 3, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Premise.\n'}]}]