Which president was served by someone whose lieutenant is Lewis Stuyvesant Chanler?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/lieutenant> <http://dbpedia.org/resource/Lewis_Stuyvesant_Chanler> . ?x <http://dbpedia.org/ontology/president> ?uri  . }
Lewis_Stuyvesant_Chanler