"op">)</span><span class="op">)</span></span>
<span><span class="va">m_pieces</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 [from Coal]             1          2                  3</span></span>
<span><span class="co">#&gt; Electricity [from Solar]            4          5                  6</span></span></code></pre></div>
</div>
<div class="section level2">
<h2 id="rename_to_piece