nced.</p>             </td>             <td class="code">               <div class="highlight"><pre><span class="nv">BALANCED_PAIRS = </span><span class="p">[</span>
  <span class="p">[</span><span class="s1">&#39;(&#39;</span><span class="p">,</span> <span class="s1">&#39;)&#39;</span><span class="p">]</span>
  <span class="p">[</span><span class="s1">&#39;[&#39;</span><span class="p">,</span> <span class="s1">&#39;]&#39;</span><span class="p">]</span>
  <span class="p">[</span><span class="s1">&#39;{&#39;