For a position in which institution were both Jack Ryan and Robert sarvis both appointed?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Jack_Ryan_(politician)> <http://dbpedia.org/ontology/nominee> ?uri. <http://dbpedia.org/resource/Robert_Sarvis> <http://dbpedia.org/ontology/nominee> ?uri . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Organisation>}
Jack_Ryan_(politician) Robert_Sarvis