</span><span class="p">]</span>

            <span class="n">neighbor_spec</span> <span class="o">=</span> <span class="p">[</span><span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">species</span><span class="p">[</span><span class="n">n</span><span class="p">])</span> <span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">neighbors</span><span class="o">.</span><span class="n">keys</span><span class=