What is the alma mater of the president whose vice president was Enrique Jos Varona?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/vicePresident> <http://dbpedia.org/resource/Enrique_José_Varona> . ?x <http://dbpedia.org/ontology/almaMater> ?uri  . }
Enrique_José_Varona