How many Mario Kart games has NDcube developed?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q8093', 'id': 0, 'label': 'Nintendo'}, {'type': 'INTERNAL', 'name_': 'Q1137109', 'id': 1, 'label': 'video game publisher'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q3337438', 'id': 2, 'label': 'NDcube'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q210167', 'id': 3, 'label': 'video game developer'}, {'type': 'INTERNAL', 'name_': 'Q1194689', 'id': 4, 'label': 'Bandai Namco Entertainment'}, {'type': 'INTERNAL', 'name_': 'Q2068675', 'id': 5, 'label': 'Mario Kart: Super Circuit'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q188196', 'id': 6, 'label': 'Mario Kart'}, {'type': 'INTERNAL', 'name_': 'Q150001', 'id': 7, 'label': 'Intelligent Systems'}, {'type': 'INTERNAL', 'name_': 'Q2575214', 'id': 8, 'label': 'Mario Kart Arcade GP'}], 'links': [{'name_': 'P31', 'source': 0, 'target': 1, 'label': 'instance of'}, {'name_': 'P1830', 'source': 0, 'target': 2, 'label': 'owner of'}, {'name_': 'P1889', 'source': 1, 'target': 3, 'label': 'different from'}, {'name_': 'P1889', 'source': 3, 'target': 1, 'label': 'different from'}, {'name_': 'P31', 'source': 4, 'target': 1, 'label': 'instance of'}, {'name_': 'P31', 'source': 4, 'target': 3, 'label': 'instance of'}, {'name_': 'P123', 'source': 5, 'target': 0, 'label': 'publisher'}, {'name_': 'P179', 'source': 5, 'target': 6, 'label': 'part of the series'}, {'name_': 'P178', 'source': 5, 'target': 7, 'label': 'developer'}, {'name_': 'P31', 'source': 7, 'target': 3, 'label': 'instance of'}, {'name_': 'P123', 'source': 8, 'target': 0, 'label': 'publisher'}, {'name_': 'P178', 'source': 8, 'target': 4, 'label': 'developer'}, {'name_': 'P179', 'source': 8, 'target': 6, 'label': 'part of the series'}]}