Question: where does the east river start and end
[{'answer': 'Long Island Sound', 'provenance': [{'wikipedia_id': '9592', 'title': 'East River', 'start_paragraph_id': 1, 'start_character': 173, 'end_paragraph_id': 1, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Upper New York Bay', 'provenance': [{'wikipedia_id': '9592', 'title': 'East River', 'start_paragraph_id': 1, 'start_character': 134, 'end_paragraph_id': 1, 'end_character': 152, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]