
        <span class="n">mat_prod</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">dot</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">dot</span><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">center</span><span class="p">),</span> <span class="n">right</span><span class="p">)</span>
        <span class="c1"># print(&#39;mat\n&#39;, mat)</span>
        <span class="c1">#