><span class="n">index</span><span class="p">,</span> <span class="n">site_j</span><span class="o">.</span><span class="n">jimage</span><span class="p">,</span> <span class="n">site_j</span><span class="o">.</span><span class="n">site</span><span class="p">)</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">queue</span><span class="p">):</span>
                <span class="n">queue</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n"