query: SELECT ?item WHERE {
    ?item wdt:P31 wd:Q5;
      wdt:P551 wd:Q4381106.
    FILTER(NOT EXISTS {
      ?wfr schema:about ?item;
        schema:isPartOf <https://en.wikipedia.org/>.
    })
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en,fr,de,pl". }
  }