Question: what is the machine in person of interest
[{'answer': 'computer system', 'provenance': [{'wikipedia_id': '31770697', 'title': 'Person of Interest (TV series)', 'start_paragraph_id': 5, 'start_character': 219, 'end_paragraph_id': 5, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '31770697', 'title': 'Person of Interest (TV series)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1041, 'bleu_score': 0.734105626116596, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18227885319021319375}, 'section': 'Section::::Abstract.'}]}]