n><span class="n">coor</span><span class="p">[</span><span class="n">idx_curr</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span><span class="mi">1</span><span class="p">],</span><span class="n">coor</span><span class="p">[</span><span class="n">idx_curr</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">],</span><span class="n">zero</span><span class="p">,</span><span class="n">zero</span><span class="p">))</sp