* @param skipDuplicateWords True to skip duplicate words, false otherwise.
     * @return This builder instance.
     */
    public SuggestRequestBuilder setSkipDuplicateWords(final boolean skipDuplicateWords) {
        request.setSkipDuplicateWords(skipDuplicateWords);
        return this;
    }

    /**
     * Adds a language to filter by.
     * @param lang The language.