Question: where does the green river start in washington
[{'answer': 'Cascade Range', 'provenance': [{'wikipedia_id': '478988', 'title': 'Green River (Duwamish River tributary)', 'start_paragraph_id': 1, 'start_character': 118, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]