 <li role="treeitem" aria-expanded="false" aria-selected="false">
              <span> Letters </span>
              <ul role="group">
                <li role="treeitem" aria-expanded="false" aria-selected="false">
                  <span> letter-1 </span>
                  <ul>
                    <li role="treeitem" aria-selected="false" class="doc">letter-1A.docx</li>
                    <li role="treeitem" aria-selected="false" class="doc">letter-1B.docx</li>
                    <li role="treeitem" ari