Question: what is the style of arch found at the great mosque at cordoba
[{'answer': 'a lower horseshoe arch', 'provenance': [{'wikipedia_id': '789030', 'title': 'Mosque–Cathedral of Córdoba', 'start_paragraph_id': 16, 'start_character': 435, 'end_paragraph_id': 16, 'end_character': 457, 'bleu_score': 1.0, 'section': 'Section::::Design.:Features.\n'}]}, {'answer': 'an upper semi-circular arch'}, {'provenance': [{'wikipedia_id': '789030', 'title': 'Mosque–Cathedral of Córdoba', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 938, 'bleu_score': 0.841125847126704, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7846840597467541998}, 'section': 'Section::::Design.:Features.\n'}]}]