">i</span><span class="p">,</span><span class="n">j</span><span class="p">)</span><span class="o">*</span><span class="p">(</span><span class="n">dy</span><span class="p">(</span><span class="n">i</span><span class="p">,</span><span class="n">j</span><span class="p">)</span><span class="o">+</span><span class="n">dy</span><span class="p">(</span><span class="n">i</span><span class="p">,</span><span class="n">j</span><span class="o">+</span><span class="mi">1</span><span class="p">))</span><span class="o">*<