What is the {currency} for {currency} of {Soviet Union}
What currency does the Soviet Union use?
What is the currency used in the Soviet Union?
SELECT DISTINCT ?z WHERE { resource:Soviet_Union property:currency ?z . ?z rdf:type ontology:currency }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q15180> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P38> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q8142> } 
 select distinct ?obj where { wd:Q15180 wdt:P38 ?obj . ?obj wdt:P31 wd:Q8142 } 