Did {Harry_Houdini} {ethnic group} {Jewish people} and {Romanians} ?
Was Houdini's background Romanian and Jewish?
Was Harry Houdini jewish and Romanian?
ASK WHERE { resource:Harry_Houdini property:ethnic_group resource:Jews . resource:Harry_Houdini property:ethnic_group resource:Romanians }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131545> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P172> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q7325>. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131545> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P172> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q485150>. } 
ASK WHERE { wd:Q131545 wdt:P172 wd:Q7325 . wd:Q131545 wdt:P172 wd:Q485150 }