m">Subitem 2 b</a>
                      <a href="#SubSubMenu1" class="list-group-item" data-toggle="collapse">Subitem 3 c <span class="glyphicon glyphicon-chevron-right"></span></a>
                      <div class="collapse list-group-submenu list-group-submenu-1" id="SubSubMenu1">
                        <a href="#" class="list-group-item">Sub sub item 1</a>
                        <a href="#" class="list-group-item">Sub sub item 2</a>
                      </div>
                      <a href="#" class=