request.setMatchWordFirst(matchWordFirst);
        return this;
    }

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

    }

    private static String parse(String rule, Set<String> dup) {
        String[] values = CSVUtil.parse(rule);
        if (dup.add(values[0]) == false) {
            throw new IllegalArgumentException("Found duplicate term [" + values[0] + "] in user dictionary.");
        }
        return rule;
    }

    public static UserDictionary getUserDictionary(Environment env, Settings settings) {

 * </ul>
 *
 * <p>
 * The class uses synchronization to ensure thread safety when accessing and modifying the URL queue.
 * It also checks for duplicate URLs before adding them to the queue,
 * both within the queue itself and against previously accessed URLs stored in the {@link MemoryDataHelper}.
 * </p>
 *
 */
/**
 * This class is an implementation of {@link UrlQueueService}.
 */