query: SELECT ?entity ?entityLabel ?entityDescription 
  WHERE
  {
    ?entity (p:P31/ps:P31) wd:Q28938152;wdt:P17 wd:Q55 . 
    MINUS { ?entity wdt: []; (p:P31/ps:P31) wd:Q28938152;wdt:P17 wd:Q55  } 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }
  }
  LIMIT 1000