What is the {television channel} for {affiliation} of {PBS}
Which television channel is affiliated to PBS?
 select distinct ?sbj where { ?sbj wdt:P1416 wd:Q215616 . ?sbj wdt:P31 wd:Q2001305 } 
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1416> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q215616> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q2001305> } 
Which channel is PBS on?