ven, then the alphabet will be referred to
        by the list of its core symbols.</p>

        <p>The <span class="pdat">standard</span>-LIKE is also optional and can be
        used to specify a reference alphabet that this alphabet might be
        sensibly compared to under most circumstances. Adding this optional flag
        will require that the alphabet you are defining has the uppercase form of
        all the reference alphabet's core symbols as well as their complements.
        The possible val