query: SELECT ?item ?itemLabel WHERE {
      ?item wdt:P1433 wd:Q655617.
      SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de". }
      FILTER NOT EXISTS { ?item wdt:P921 ?mainSubject }
      FILTER NOT EXISTS { ?item wdt:P136 wd:Q5185279 }
  }