o">.</span><span class="n">_diffSets</span><span class="p">[</span><span class="n">newKey</span><span class="p">]</span> <span class="o">=</span> <span class="p">[</span><span class="n">unionSup</span><span class="p">,</span> <span class="n">unionDiffSet</span><span class="p">]</span>
                        <span class="n">newList</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">newKey</span><span class="p">)</span>
                    <span class="k">else<