ions</span>       

        <span class="c1"># First priority goes to a custom set</span>
        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">only</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">key</span> <span class="ow">in</span> <span class="n">only</span><span class="p">:</span>
                <span class="n">results</span><span class="p">[