How many universities are located in Cambridge?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q49111', 'id': 0, 'label': 'Cambridge'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q273863', 'id': 1, 'label': 'Tsukuba'}], 'links': [{'name_': 'P190', 'source': 1, 'target': 0, 'label': 'twinned administrative body'}]}