ANK</b> returns the location of the first nonblank.
        </li>
        <li>
          <b>S_INDEX_LAST</b> finds the LAST occurrence of a given substring.
        </li>
        <li>
          <b>S_INDEXI</b> is a case-insensitive INDEX function.
        </li>
        <li>
          <b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
        </li>
        <li>
          <b>S_LOW</b> replaces all uppercase letters by lowercase ones.
        </li>
        <li>
          <b>S_REVERSE</b> re