Question: architectural elements forming rib vaults eg wells cathedral
[{'answer': 'barrel vaults', 'provenance': [{'wikipedia_id': '528823', 'title': 'Rib vault', 'start_paragraph_id': 8, 'start_character': 223, 'end_paragraph_id': 8, 'end_character': 236, 'bleu_score': 1.0, 'section': 'Section::::History and development.:From Norman and Romanesque to the Gothic rib vault.\n'}]}, {'answer': 'an armature of piped masonry often carved in decorative patterns'}, {'answer': 'an armature of piped masonry'}, {'answer': 'two to three barrel vaults'}, {'provenance': [{'wikipedia_id': '528823', 'title': 'Rib vault', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1632809255202718553}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '528823', 'title': 'Rib vault', 'section': 'Section::::History and development.:From Norman and Romanesque to the Gothic rib vault.\n', 'start_paragraph_id': 8, 'end_paragraph_id': 8, 'meta': {'evidence_span': ['Romanesque churches traditionally covered the nave with a barrel vault, with round arches, or a groin vault, formed when two barrel vaults met at right angles.', 'barrel vaults']}}]}]