Question: when did the surface pro 4 come out
[{'answer': 'October 26 , 2015', 'provenance': [{'wikipedia_id': '46470075', 'title': 'Surface Pro 4', 'start_paragraph_id': 5, 'start_character': 180, 'end_paragraph_id': 5, 'end_character': 197, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '46470075', 'title': 'Surface Pro 4', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 288, 'bleu_score': 0.8703737209656041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18288894412091704634}, 'section': 'Section::::Abstract.'}]}]