/span><span class="w"> </span><span class="n">level</span><span class="p">,</span><span class="w"> </span><span class="n">N</span><span class="p">)</span>
<span class="w">            </span><span class="n">S</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fill_level</span><span class="w"> </span><span class="o">&lt;=</span><span class="w"> </span><span class="n">level</span><span class="p">)</span>
<span class="w">        </span><span cla