query: SELECT DISTINCT  ?qualifier ?qualifierLabel ?asObject ?asObjectLabel
  WHERE
  {
    wd:P3990 wikibase:claim ?p .
    ?qualifier wikibase:qualifier ?q .
    ?item ?p ?prop . 
    ?prop ?q ?asObject .
    ?property wikibase:statementProperty ?ps .
    ?prop ?ps ?value .
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en,bg"  }    
  }
  ORDER BY ASC(?value) 
  LIMIT 1000