n>
<span>                       notation <span class="op">=</span> <span class="fu">RCLabels</span><span class="fu">::</span><span class="va"><a href="https://matthewheun.github.io/RCLabels/reference/bracket_notation.html" class="external-link">bracket_notation</a></span><span class="op">)</span></span>
<span><span class="co">#&gt;             Motors -&gt; MD Cars -&gt; MD LED lamps -&gt; Light</span></span>
<span><span class="co">#&gt; Electricity            1          2                  3</span></span>
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