How many Zelda games have come out on Switch?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q19610114', 'id': 0, 'label': 'Nintendo Switch'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q12393', 'id': 1, 'label': 'The Legend of Zelda'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q2533508', 'id': 2, 'label': 'recurring enemies in The Legend of Zelda series'}], 'links': [{'name_': 'P400', 'source': 1, 'target': 0, 'label': 'platform'}, {'name_': 'P1881', 'source': 1, 'target': 2, 'label': 'list of characters'}]}