for (int n = 0; n < length; n++) {
      builder.append(
          randomCharFrom(list.get(n) >= threshold ? NONMATCHING_CHARS : matchingChars, rand));
    }
    return builder.toString();
  }

  private static char randomCharFrom(String s, Random rand) {
    return s.charAt(rand.nextInt(s.length()));
  }

  /**
   * Provides samples on a random distribution derived from the web.
   *

    for (int n = 0; n < length; n++) {
      builder.append(
          randomCharFrom(list.get(n) >= threshold ? NONMATCHING_CHARS : matchingChars, rand));
    }
    return builder.toString();
  }

  private static char randomCharFrom(String s, Random rand) {
    return s.charAt(rand.nextInt(s.length()));
  }

  /**
   * Provides samples on a random distribution derived from the web.
   *

    public static final String LABELS_footer_back_to_top = "{labels.footer_back_to_top}";

    /** The key of the message: Fess */
    public static final String LABELS_header_brand_name = "{labels.header_brand_name}";

    /** The key of the message: Options */
    public static final String LABELS_header_form_option_btn = "{labels.header_form_option_btn}";

    /** The key of the message: File Crawling */