Question: when did the google pixel 2 xl come out
[{'answer': 'October 19 , 2017', 'provenance': [{'wikipedia_id': '55440889', 'title': 'Pixel 2', 'start_paragraph_id': 1, 'start_character': 251, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]