="sd">    &quot;&quot;&quot;</span>
    <span class="n">n_atoms_max</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="n">atomic_numbers</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
    <span class="n">symbols</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
    <span class="n">min_distance</span> <span class="o">=</span> <span class="kc">None</span>

    <span class="k">for</span> <span class="n">system</spa