DO I, DO K, DO J loops.
        </li>
        <li>
          <b>MXM_JIK</b> computes A = B * C using DO J, DO I, DO K loops.
        </li>
        <li>
          <b>MXM_JKI</b> computes A = B * C using DO J, DO K, DO I loops.
        </li>
        <li>
          <b>MXM_KIJ</b> computes A = B * C using DO K, DO I, DO J loops.
        </li>
        <li>
          <b>MXM_KJI</b> computes A = B * C using DO K, DO J, DO I loops.
        </li>
        <li>
          <b>S_LEN_TRIM</b> returns the length of a strin