How many cities in Japan were hit by nuclear bomb during World War II?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q148', 'id': 0, 'label': "People's Republic of China"}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q17', 'id': 1, 'label': 'Japan'}, {'type': 'INTERNAL', 'name_': 'Q48', 'id': 2, 'label': 'Asia'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q27231', 'id': 3, 'label': 'East Asia'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q362', 'id': 4, 'label': 'World War II'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P530', 'source': 0, 'target': 1, 'label': 'diplomatic relation'}, {'name_': 'P30', 'source': 0, 'target': 2, 'label': 'continent'}, {'name_': 'P361', 'source': 0, 'target': 3, 'label': 'part of'}, {'name_': 'P527', 'source': 2, 'target': 3, 'label': 'has part(s)'}, {'name_': 'P276', 'source': 4, 'target': 2, 'label': 'location'}]}