Question: What is the order of the Henry Clay and profession of the William Luther Hill?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
 SELECT DISTINCT ?uri WHERE { res:Henry_Clay prop:order ?uri. res:William_Luther_Hill onto:profession ?uri}