Question: who did the kingdom of kush trade with
[{'answer': 'Petronius', 'provenance': [{'wikipedia_id': '21624273', 'title': 'Kingdom of Kush', 'start_paragraph_id': 35, 'start_character': 416, 'end_paragraph_id': 35, 'end_character': 425, 'bleu_score': 1.0, 'section': 'Section::::History.:Meroitic period.\n'}]}, {'provenance': [{'wikipedia_id': '21624273', 'title': 'Kingdom of Kush', 'start_paragraph_id': 36, 'start_character': 0, 'end_paragraph_id': 36, 'end_character': 672, 'bleu_score': 0.9815648442794911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1426052372382728456}, 'section': 'Section::::History.:Meroitic period.\n'}]}]