query: SELECT ?l ?lemma ?length WHERE {
     ?l a ontolex:LexicalEntry ; dct:language ?language ;
          wikibase:lemma ?lemma .
    ?language wdt:P218 'cs' .
    FILTER REGEX ( lcase(?lemma), "^[^aáeéěiíoóuúůyý]*$")
    BIND ( strlen(?lemma) as ?length )
  }
  ORDER BY DESC(?length) 