query: prefix wdt: <http://www.wikidata.org/prop/direct/>
  prefix entity: <http://www.wikidata.org/entity/>
  SELECT ?item WHERE {
    ?item wdt:P31 entity:Q3305213 .
    OPTIONAL { ?item wdt:P2049 ?dummy0 }
    FILTER(!bound(?dummy0))
    OPTIONAL { ?item wdt:P2048 ?dummy1 }
    FILTER(!bound(?dummy1))
  }