Question: what does ar stand for in a rifle
[{'answer': 'ArmaLite Rifle', 'provenance': [{'wikipedia_id': '1666861', 'title': 'List of ArmaLite rifles', 'start_paragraph_id': 1, 'start_character': 430, 'end_paragraph_id': 1, 'end_character': 444, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1666861', 'title': 'List of ArmaLite rifles', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 444, 'bleu_score': 0.9392234271418961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18334998144732074562}, 'section': 'Section::::Abstract.'}]}]