Question: when were electric christmas tree lights first used
[{'answer': 'December 22 , 1882', 'provenance': [{'wikipedia_id': '791483', 'title': 'Christmas lights', 'start_paragraph_id': 8, 'start_character': 462, 'end_paragraph_id': 8, 'end_character': 482, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '791483', 'title': 'Christmas lights', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 978, 'bleu_score': 0.9873009432531991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14524323929392963914}, 'section': 'Section::::History.\n'}]}]