Question: when did the mudslide happen in sierra leone
[{'answer': 'August 14 , 2017', 'provenance': [{'wikipedia_id': '54901237', 'title': '2017 Sierra Leone mudslides', 'start_paragraph_id': 1, 'start_character': 18, 'end_paragraph_id': 1, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]