query: SELECT ?length (COUNT(?lemma) AS ?count ) WHERE {
     ?l a ontolex:LexicalEntry ; dct:language ?language ;
          wikibase:lemma ?lemma .
    ?language wdt:P218 'cs' .
    FILTER REGEX ( ?lemma, "^[^\\s]*$")
    BIND ( strlen(?lemma) as ?length )
  }
  GROUP BY ?length
  ORDER BY ASC(?length) 