                
                  <a class="dropdown-item" href="../23-bsts-2/index.html">  23.  3/2 Binary Search Trees, Part II </a>
                
                  <a class="dropdown-item" href="../24-beyond-data-structures/index.html">  24.  3/4 Beyond Data Structures </a>
                
                  <a class="dropdown-item" href="../25-graphs.html">  25.  3/7 Graphs </a>
                
                  <a class="dropdown-item" href="../26-msts.html">  26.  3/9 Minimum Spanning Trees </a>
