query: SELECT ?init (COUNT(*) AS ?ct) (SAMPLE(?label) AS ?sample) {
    ?item wdt:P762 [] .
    MINUS { ?item wdt:P31 [] } .
    ?item rdfs:label ?label FILTER( LANG( ?label ) = 'cs' ) .
    BIND( IF( CONTAINS( STR( ?label ), ' ' ), STRBEFORE( STR( ?label ), ' ' ), STR( ?label ) ) AS ?init ) .
  } GROUP BY ?init ORDER BY DESC(?ct)