How many main Assassin's Creed games are available for Nintendo Switch?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q188273', 'id': 0, 'label': 'Ubisoft'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q19610114', 'id': 1, 'label': 'Nintendo Switch'}, {'type': 'INTERNAL', 'name_': 'Q165970', 'id': 2, 'label': 'touchscreen'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q695299', 'id': 3, 'label': 'Ubisoft Blue Byte'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q420292', 'id': 4, 'label': "Assassin's Creed"}, {'type': 'INTERNAL', 'name_': 'Q327594', 'id': 5, 'label': 'Final Fantasy XII'}, {'type': 'INTERNAL', 'name_': 'Q18711530', 'id': 6, 'label': "Assassin's Creed Identity"}], 'links': [{'name_': 'P1830', 'source': 0, 'target': 3, 'label': 'owner of'}, {'name_': 'P479', 'source': 1, 'target': 2, 'label': 'input device'}, {'name_': 'P750', 'source': 5, 'target': 0, 'label': 'distributed by'}, {'name_': 'P400', 'source': 5, 'target': 1, 'label': 'platform'}, {'name_': 'P123', 'source': 6, 'target': 0, 'label': 'publisher'}, {'name_': 'P479', 'source': 6, 'target': 2, 'label': 'input device'}, {'name_': 'P178', 'source': 6, 'target': 3, 'label': 'developer'}, {'name_': 'P179', 'source': 6, 'target': 4, 'label': 'part of the series'}]}