>
        <li>
          <b>S_CAP</b> replaces any lowercase letters by uppercase ones in a string.
        </li>
        <li>
          <b>S_CAT</b> concatenates two strings to make a third string.
        </li>
        <li>
          <b>S_CAT1</b> concatenates two strings, with a single blank separator.
        </li>
        <li>
          <b>S_CH_BLANK</b> replaces each occurrence of a particular character by a blank.
        </li>
        <li>
          <b>S_CH_COUNT</b> counts occurrences of a particul