Output

<li class="">
    <a href="#">
        <i class="fa fa-check-square"></i>
        <span class="nav-label">1, 1</span>
        <span class="fa arrow"></span>
    </a>
    <ul class="nav nav-second-level collapse" style="height: 0px;">
        <li class=""><a href="#">1-subitem1, 1A</a></li>
        <li class=""><a href="#">1-subitem2, 1B</a></li>
    </ul>
</li>

<li class="">
    <a href="#">
        <i class="fa fa-list"></i>
        <span class="nav-label">2, 2</span>
        <span class="fa arrow"></span>
    </a>
    <ul class="nav nav-second-level collapse" style="height: 0px;">
        <li class=""><a href="#">2-subitem1, 2A</a></li>
    </ul>
</li>

<li class="">
    <a href="#">
        <i class="fa fa-cogs"></i>
        <span class="nav-label">3, 3</span>
        <span class="fa arrow"></span>
    </a>
</li>