How many shows belong to the networks one of whose sister station is BBC News?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/sisterNames> <http://dbpedia.org/resource/BBC_News_(TV_channel)> . ?uri <http://dbpedia.org/ontology/network> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/TelevisionShow>}
BBC_News_(TV_channel)