an><span class="p">()</span>
        <span class="n">keys</span> <span class="o">=</span> <span class="p">[</span><span class="n">i</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">points</span><span class="o">.</span><span class="n">keys</span><span class="p">()]</span>
        <span class="n">values</span> <span class="o">=</span> <span class="p">[</span><span class="n">i</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</sp