Question: Which country's people have graduated from Ghana School of Law?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/almaMater> <http://dbpedia.org/resource/Ghana_School_of_Law> . ?x <http://dbpedia.org/ontology/nationality> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}