<ul>
      <li>single level
      </li>
      <li>double level - top
        <ul>
          <li>double level - top
          </li>
          <li>double level - first subitem
          </li>
          <li>double level - second subitem
          </li>
        </ul>
      </li>
      <li>triple level - top
        <ul>
          <li>triple level - top
          </li>
          <li>triple level - subitem with no subitem
          </li>
          <li>triple level - subitem with subitem
            <ul>
              <li>triple level - subitem with subitem
              </li>
              <li>triple level - subitem one of subitem
              </li>
              <li>triple level - subitem two of subitem
              </li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>