Question: Who is the common prime minster of William Deaner and mark Latham ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/William_Deane> <http://dbpedia.org/ontology/primeMinister> ?uri. <http://dbpedia.org/resource/Mark_Latham> <http://dbpedia.org/property/primeminister> ?uri}