Who was the longest running Roman emperor?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q842606', 'id': 0, 'label': 'Roman emperor'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q39018', 'id': 1, 'label': 'emperor'}], 'links': [{'name_': 'P279', 'source': 0, 'target': 1, 'label': 'subclass of'}]}
Emperor is a subclass of Roman emperor.
The Roman emperor is a subclass of the Emperor .
Who was the longest running Roman emperor?</s>Emperor is a subclass of Roman [unused1]emperor                [unused2] .
Who was the longest running Roman emperor?</s>Emperor is a subclass of Roman emperor.
Who was the longest running Roman emperor?</s>The Roman [unused1]emperor                [unused2] is a subclass of the Emperor .
Who was the longest running Roman emperor?</s>The Roman emperor is a subclass of the Emperor .
Who was the longest running Roman emperor?</s>Roman emperor,0,Roman emperor,Roman emperor,subclass of,[unused1]emperor[unused2],[unused1]emperor[unused2],0,Roman emperor,[unused1]emperor[unused2],0,[unused1]emperor[unused2]
Who was the longest running Roman emperor?</s>Roman emperor,0,Roman emperor,Roman emperor,subclass of,emperor,emperor,0,Roman emperor,emperor,0,emperor