Question: Which country's engineered have studied at Aero Klub in Wroclaw?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/institution> <http://dbpedia.org/resource/AeroKlub_Wrocław> . ?x <http://dbpedia.org/property/nationality> ?uri  . }
Answer: The nationalities of the engineers trained at Aero Klub Wrocław institution are [Ukraine, Canada].