Question: where does the cumberland river begin and end
[{'answer': 'Ohio River', 'provenance': [{'wikipedia_id': '562687', 'title': 'Cumberland River', 'start_paragraph_id': 1, 'start_character': 247, 'end_paragraph_id': 1, 'end_character': 257, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Confluence of Clover Fork and Martins Fork'}]