Question: Which are the previous broadcast networks of sister channels of WGBC?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/WGBC_(DT2)> prop:sisterStations ?x . ?x onto:formerBroadcastNetwork ?uri  . }