Question: when did the sri lankan civil war begin and end
[{'answer': '23 July 1983', 'provenance': [{'wikipedia_id': '225283', 'title': 'Sri Lankan Civil War', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '18 May 2009', 'provenance': [{'wikipedia_id': '225283', 'title': 'Sri Lankan Civil War', 'start_paragraph_id': 139, 'start_character': 118, 'end_paragraph_id': 139, 'end_character': 129, 'bleu_score': 1.0, 'section': "Section::::End of the war.:18 May: First claim of Prabhakaran's death.\n"}]}]