
                <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">line</span><span class="p">[</span><span class="mi">0</span><span class="p">]:</span>
                    <span class="k">if</span> <span class="n">k</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">twu</span><span class="p">:</span>
                        <span class="n">twu</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o