Who was a ruler of Egypt's First Dynasty and has no successors?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q11768', 'id': 0, 'label': 'ancient Egypt'}, {'type': 'INTERNAL', 'name_': 'Q151805', 'id': 1, 'label': 'Semerkhet'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q203859', 'id': 2, 'label': 'First Dynasty of Egypt'}], 'links': [{'name_': 'P27', 'source': 1, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P53', 'source': 1, 'target': 2, 'label': 'family'}]}