an> <span class="p">[]</span>
        <span class="k">for</span> <span class="n">sys</span><span class="p">,</span> <span class="n">inc</span><span class="p">,</span> <span class="n">exc</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">system</span><span class="p">,</span> <span class="n">include</span><span class="p">,</span> <span class="n">exclude</span><span class="p">):</span>
            <span class="n">n_atoms</span> <span class="o">=</span> <span c