How many people have written stuff broadcasted on the Tokyo Broadcasting System?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/network> <http://dbpedia.org/resource/Tokyo_Broadcasting_System> . ?x <http://dbpedia.org/property/writer> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}
Tokyo_Broadcasting_System