protected String toLetter(String c) {
    if(" ".equals(c)) return "space";
    if("<".equals(c)) return "less then";
    if(">".equals(c)) return "grater then";
    if("&".equals(c)) return "ampersand";
    if("\\".equals(c)) return "back slash";
    if("/".equals(c)) return "slash";
    if("'".equals(c)) return "quote";
    if("\"".equals(c)) return "double quote";
    return c;
  }