Question: where does the euphrates river begin and end
[{'answer': 'eastern Turkey', 'provenance': [{'wikipedia_id': '10221', 'title': 'Euphrates', 'start_paragraph_id': 1, 'start_character': 294, 'end_paragraph_id': 1, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Shatt al - Arab', 'provenance': [{'wikipedia_id': '10221', 'title': 'Euphrates', 'start_paragraph_id': 7, 'start_character': 486, 'end_paragraph_id': 7, 'end_character': 503, 'bleu_score': 1.0, 'section': 'Section::::Course.\n'}]}, {'provenance': [{'wikipedia_id': '10221', 'title': 'Euphrates', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 429, 'bleu_score': 0.7000728817906431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8468321948138864364}, 'section': 'Section::::Abstract.'}]}]