idebar-item-text sidebar-link">
 <span class="menu-text">Overview</span></a>
  </div>
</li>
          <li class="sidebar-item">
  <div class="sidebar-item-container"> 
  <a href="../../phonological-patterns/formal-definition/two-equivalent-definitions.html" class="sidebar-item-text sidebar-link">
 <span class="menu-text">Two equivalent definitions</span></a>
  </div>
</li>
          <li class="sidebar-item">
  <div class="sidebar-item-container"> 
  <a href="../../phonological-patterns/formal-definition/the