Question: when did the war in south sudan start
[{'answer': '15 December 2013', 'provenance': [{'wikipedia_id': '41382446', 'title': 'South Sudanese Civil War', 'start_paragraph_id': 12, 'start_character': 35, 'end_paragraph_id': 12, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Course of the conflict.:Initial mutiny (2013).\n'}]}]