Question: Who is the president of Carl Stokes nad Wyche Fowler ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Carl_Stokes> <http://dbpedia.org/property/president> ?uri. <http://dbpedia.org/resource/Wyche_Fowler> <http://dbpedia.org/ontology/president> ?uri}