});
    }

    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        validate(form, messages -> {}, this::asDictIndexHtml);
        pageNumber.ifPresent(num -> {
            kuromojiPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            kuromojiPager.setCurrentPageNumber(0);
        });