Question: when did the douglas high school shooting happen
[{'answer': 'February 14 , 2018', 'provenance': [{'wikipedia_id': '56589491', 'title': 'Stoneman Douglas High School shooting', 'start_paragraph_id': 1, 'start_character': 3, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]