R8 from a string.
        </li>
        <li>
          <b>S_TO_R8VEC</b> reads an R8VEC from a string.
        </li>
        <li>
          <b>S_TO_ROT13</b> "rotates" the alphabetical characters in a string by 13 positions.
        </li>
        <li>
          <b>S_WORD_COUNT</b> counts the number of "words" in a string.
        </li>
        <li>
          <b>S_WORD_EXTRACT_FIRST</b> extracts the first word from a string.
        </li>
        <li>
          <b>SORT_HEAP_EXTERNAL</b> externally sorts a li