 
          
        </ul>
      </nav>
    </li>
  

    
  </ul>
</nav>
                  </div>
                </div>
              </div>
            
            
          
          <div class="md-content" data-md-component="content">
            <article class="md-content__inner md-typeset">
              
                
                
                  <h1>Ex. 12.4</h1>
                
                <details class="question" open="open"><summary>Ex. 12.4</summary><p>Suppose you perform a re