span><span class="n">all</span><span class="p">():</span>
                    <span class="k">yield</span> <span class="n">bounds</span></div>


    <span class="k">def</span> <span class="nf">_chunk_bounds</span><span class="p">(</span>
        <span class="bp">self</span><span class="p">,</span>
        <span class="n">x</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span>
        <span class="n">y</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</s