e_by_three</span><span class="op">:</span> <span class="nam">Coord</span> <span class="op">=</span> <span class="nam">np</span><span class="op">.</span><span class="nam">array</span><span class="op">(</span><span class="op">[</span><span class="num">3</span><span class="op">,</span> <span class="num">3</span><span class="op">]</span><span class="op">)</span>&nbsp;</span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t16" href="#t16">16</a></span><span class="t">        <span class="na