sion</span> <span class="special">&gt;&gt;</span> <span class="char">')'</span><span class="special">;</span>
<span class="identifier">factor</span>      <span class="special">=</span> <span class="identifier">integer</span> <span class="special">|</span> <span class="identifier">group</span><span class="special">;</span>
<span class="identifier">term</span>        <span class="special">=</span> <span class="identifier">factor</span> <span class="special">&gt;&gt;</span> <span class="special">*((</span><spa