Who has a longer reign, Genghis Khan or Kublai Khan?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q720', 'id': 0, 'label': 'Genghis Khan'}, {'type': 'INTERNAL', 'name_': 'Q12557', 'id': 1, 'label': 'Mongol Empire'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q7523', 'id': 2, 'label': 'Kublai Khan'}], 'links': [{'name_': 'P35', 'source': 1, 'target': 0, 'label': 'head of state'}, {'name_': 'P35', 'source': 1, 'target': 2, 'label': 'head of state'}, {'name_': 'P19', 'source': 2, 'target': 1, 'label': 'place of birth'}]}