What is the state of origin of the president whose alma mater is Hellenic Naval Academy ?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/almaMater> <http://dbpedia.org/resource/Hellenic_Naval_Academy> . ?x <http://dbpedia.org/ontology/stateOfOrigin> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/President>}
Hellenic_Naval_Academy