
              <ul class="nav flex-column">
              </ul>
            </li>
            <li class="nav-item" data-level="3"><a href="#example-7-mono-amplifier" class="nav-link">Example 7: Mono Amplifier</a>
              <ul class="nav flex-column">
              </ul>
            </li>
            <li class="nav-item" data-level="3"><a href="#example-8-stereo-amplifier" class="nav-link">Example 8: Stereo Amplifier</a>
              <ul class="nav flex-column">
              </ul>
            </li>
  