;)</span>
                                <span class="n">D</span><span class="o">.</span><span class="n">array</span><span class="p">[</span><span class="n">rowLabels</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">v</span><span class="p">)][</span><span class="n">rowLabels</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">u</span><span class="p">)]</span> <span class="o">=</span> <span class="n">k</span>
    