  <li><a href="#names-and-variables">Names and variables</a></li>
            <ul>
              <li><a href="#indices-and-mathematical-symbols">Indices and mathematical symbols</a></li>
              <li><a href="#o-and-l">'o' and 'l'</a></li>
              <li><a href="#unnecessary-variables">Unnecessary variables</a></li>
              <li><a href="#profanity">Profanity</a></li>
              <li><a href="#naming-convention">Naming convention</a></li>
            </ul>
            <li><a href="#spacing-a