ues for <span class="pdat">standard</span> include DNA,
        RNA and PROTEIN.</p>
        <p>For example if you were creating an alphabet that extended the DNA
        alphabet you might use a header like:</p>
        <div class="example">
          ALPHABET &quot;Extended DNA&quot; DNA-LIKE
        </div>
        <p>This would require that the alphabet you were defining contained A,
        C, G and T and that A was the complement of T and C was the complement
        of G.</p>
      </div>


      <h4 