query: SELECT ?item ?country {
    {
      SELECT ?item  { 
        ?item p:P1532 []
      } GROUP BY ?item HAVING(COUNT(*)=1)
    }
    ?item p:P1532[ps:P1532 ?country; prov:wasDerivedFrom/pr:P143 wd:Q48183]
    FILTER NOT EXISTS { ?item wdt:P27 ?country } 
  }