Question: where does the river roch begin and end
[{'answer': 'Chelburn Moor', 'provenance': [{'wikipedia_id': '920612', 'title': 'River Roch', 'start_paragraph_id': 3, 'start_character': 10, 'end_paragraph_id': 3, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Course.\n'}]}, {'answer': 'River Irwell , Radcliffe'}]