Question: when did hurricane maria make landfall in puerto rico
[{'answer': 'September 20', 'provenance': [{'wikipedia_id': '55262011', 'title': 'Hurricane Maria', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]