Question: who are the three main powers in 1984
[{'answer': 'Oceania', 'provenance': [{'wikipedia_id': '19245926', 'title': 'Nations of Nineteen Eighty-Four', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Eurasia', 'provenance': [{'wikipedia_id': '19245926', 'title': 'Nations of Nineteen Eighty-Four', 'start_paragraph_id': 1, 'start_character': 9, 'end_paragraph_id': 1, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Eastasia', 'provenance': [{'wikipedia_id': '19245926', 'title': 'Nations of Nineteen Eighty-Four', 'start_paragraph_id': 1, 'start_character': 21, 'end_paragraph_id': 1, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19245926', 'title': 'Nations of Nineteen Eighty-Four', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 122, 'bleu_score': 0.8914703664390791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11430140460593313231}, 'section': 'Section::::Abstract.'}]}]