Question: where did the umayyads move the capital of the muslim empire
[{'answer': 'Kufa', 'provenance': [{'wikipedia_id': '49855', 'title': 'Umayyad Caliphate', 'start_paragraph_id': 13, 'start_character': 342, 'end_paragraph_id': 13, 'end_character': 346, 'bleu_score': 1.0, 'section': 'Section::::History.:Origins.:Caliphate of Uthman.\n'}]}]