Who built the first successful airplane?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q197', 'id': 0, 'label': 'airplane'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q1949826', 'id': 1, 'label': 'powered aircraft'}], 'links': [{'name_': 'P279', 'source': 0, 'target': 1, 'label': 'subclass of'}]}
The powered aircraft subclass is the airplane.
A powered aircraft is classed as an aircraft .
Who built the first successful airplane?</s>The [unused1]powered aircraft                [unused2] subclass is the airplane.
Who built the first successful airplane?</s>The powered aircraft subclass is the airplane.
Who built the first successful airplane?</s>A [unused1]powered aircraft                [unused2] is classed as an aircraft .
Who built the first successful airplane?</s>A powered aircraft is classed as an aircraft .
Who built the first successful airplane?</s>airplane,0,airplane,airplane,subclass of,[unused1]powered aircraft[unused2],[unused1]powered aircraft[unused2],0,airplane,[unused1]powered aircraft[unused2],0,[unused1]powered aircraft[unused2]
Who built the first successful airplane?</s>airplane,0,airplane,airplane,subclass of,powered aircraft,powered aircraft,0,airplane,powered aircraft,0,powered aircraft