Question: In which country was GM was firt aired which is also the mouth country of Upper Neretva?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Upper_Neretva> <http://dbpedia.org/ontology/mouthCountry> ?uri. <http://dbpedia.org/resource/Gümüş_(TV_series)> <http://dbpedia.org/property/firstAired> ?uri}