Question: What is the president whose lieutenants are Winston Bryant and Joe Purcell?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/ontology/lieutenant> <http://dbpedia.org/resource/Winston_Bryant> . ?uri <http://dbpedia.org/ontology/lieutenant> <http://dbpedia.org/resource/Joe_Purcell> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/President>}