t until modified</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">parent</span> <span class="o">=</span> <span class="kc">None</span>

        <span class="c1"># Literals never have any subrules</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">subrules</span> <span class="o">=</span> <span class="p">[]</span></div>


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