Question: what type of motor used in vacuum cleaner
[{'answer': 'universal motors', 'provenance': [{'wikipedia_id': '2495995', 'title': 'Universal motor', 'start_paragraph_id': 2, 'start_character': 468, 'end_paragraph_id': 2, 'end_character': 484, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2495995', 'title': 'Universal motor', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 523, 'bleu_score': 0.707524115493938, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6012609961278612759}, 'section': 'Section::::Applications.:Domestic appliances.\n'}]}]