/span><span class="p">,</span> <span class="p">(</span><span class="n">VertexClustering</span><span class="p">,</span> <span class="n">VertexCover</span><span class="p">)):</span>
                <span class="c1"># Vertex clustering</span>
                <span class="n">group_iter</span> <span class="o">=</span> <span class="p">((</span><span class="n">group</span><span class="p">,</span> <span class="n">color</span><span class="p">)</span> <span class="k">for</span> <span class="n">color</span><span class