Question: when did royal mail and post office split
[{'answer': '2013', 'provenance': [{'wikipedia_id': '349823', 'title': 'Royal Mail', 'start_paragraph_id': 3, 'start_character': 255, 'end_paragraph_id': 3, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '349823', 'title': 'Royal Mail', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 443, 'bleu_score': 0.9121639628967181, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9748454750772559486}, 'section': 'Section::::Abstract.'}]}]