How many teams has Tom Brady played for?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q1860', 'id': 1, 'label': 'English'}, {'type': 'INTERNAL', 'name_': 'Q8229', 'id': 2, 'label': 'Latin script'}, {'type': 'INTERNAL', 'name_': 'Q19931195', 'id': 3, 'label': 'Dollar Bill'}, {'type': 'INTERNAL', 'name_': 'Q232343', 'id': 4, 'label': 'Bridget Moynahan'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q313381', 'id': 5, 'label': 'Tom Brady'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q15789615', 'id': 6, 'label': 'Brady'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P37', 'source': 0, 'target': 1, 'label': 'official language'}, {'name_': 'P17', 'source': 1, 'target': 0, 'label': 'country'}, {'name_': 'P282', 'source': 1, 'target': 2, 'label': 'writing system'}, {'name_': 'P27', 'source': 3, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P734', 'source': 3, 'target': 6, 'label': 'family name'}, {'name_': 'P27', 'source': 4, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P1412', 'source': 4, 'target': 1, 'label': 'languages spoken, written or signed'}, {'name_': 'P451', 'source': 4, 'target': 5, 'label': 'unmarried partner'}, {'name_': 'P282', 'source': 6, 'target': 2, 'label': 'writing system'}]}