   <span class="k">return</span><span class="p">(</span><span class="n">xf</span><span class="p">,</span> <span class="n">yf</span><span class="p">)</span></div>



<span class="c1"># In[ ]:</span>

<span class="c1"># _______________________________________EXAMPLE_________________________________________</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>

    <span class="kn">import</span> <span cla