ernatives are represented in PEG using the slash:
      </p>
<pre class="programlisting"><span class="identifier">a</span> <span class="special">/</span> <span class="identifier">b</span>
</pre>
<div class="note"><table border="0" summary="Note">
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../images/note.png"></td>
<th align="left">Note</th>
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<tr><td align="left" valign="top"><p>
          In <span class="emphasis"><em>Spirit.Qi</em></span> and <span class="emp