 class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">c2i</span><span class="p">[</span><span class="n">char</span><span class="p">]</span> <span class="k">for</span> <span class="n">char</span> <span class="ow">in</span> <span class="n">word_str</span><span class="o">.</span><span class="n">lower</span><span class="p">()]</span>
    
    <span class="k">def</span> <span class="nf">decode</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <spa