flushes a string left.
        </li>
        <li>
          <b>S_BEGIN</b> is TRUE if one string matches the beginning of the other.
        </li>
        <li>
          <b>S_EQI</b> is a case insensitive comparison of two strings for equality.
        </li>
        <li>
          <b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
        </li>
        <li>
          <b>S_TO_I4</b> reads an I4 from a string.
        </li>
        <li>
          <b>S_TO_I4VEC</b> reads an I4VEC from a str