Question: where did the abbasids moved their capital to
[{'answer': 'Baghdad', 'provenance': [{'wikipedia_id': '49856', 'title': 'Abbasid Caliphate', 'start_paragraph_id': 1, 'start_character': 322, 'end_paragraph_id': 1, 'end_character': 329, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Raqqa', 'provenance': [{'wikipedia_id': '49856', 'title': 'Abbasid Caliphate', 'start_paragraph_id': 65, 'start_character': 628, 'end_paragraph_id': 65, 'end_character': 633, 'bleu_score': 1.0, 'section': 'Section::::Culture.:Architecture.\n'}]}, {'answer': 'Samarra', 'provenance': [{'wikipedia_id': '49856', 'title': 'Abbasid Caliphate', 'start_paragraph_id': 27, 'start_character': 172, 'end_paragraph_id': 27, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Fracture to autonomous dynasties (861–945).\n'}]}, {'answer': 'Cairo', 'provenance': [{'wikipedia_id': '49856', 'title': 'Abbasid Caliphate', 'start_paragraph_id': 4, 'start_character': 554, 'end_paragraph_id': 4, 'end_character': 559, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]