.
        </li>
        <li>
          <a href = "s_len_trim.m">s_len_trim.m</a> 
          returns the length of a string to the last nonblank.
        </li>
        <li>
          <a href = "timestamp.m">timestamp.m</a> 
          prints the current YMDHMS date as a timestamp.
        </li>
        <li>
          <a href = "tuple_next_fast.m">tuple_next_fast.m</a> 
          computes the next element of a tuple space, "fast".
        </li>
        <li>
          <a href = "user.m">user.m</a> 
          a 