query: #title: Qualifier P407 missing (LL filename)
  # Complex constraint from [[Property talk:P443]]
  # add qualifier (easy)
  SELECT ?item ?itemLabel ?file ?lang
  {
  	?item wdt:P443 ?value .
      MINUS { ?item p:P443 [ pq:P407 [] ] }
      MINUS { ?item rdf:type [] }
      BIND(replace(wikibase:decodeUri(SUBSTR(STR(?value), 52)),"_"," ") AS ?file)  
      FILTER ( REGEX( ?file, "^LL-.+$")  )
      BIND( replace( ?file, "^LL-(Q\\d+) .+$", "$1") as ?lang)
  }
  LIMIT 100