n> "GB"<span style="color: #949494;">, </span>"GB"<span style="color: #949494;">, </span>"GB"</span></span>
<span><span class="co">#&gt; $ Year        <span style="color: #949494; font-style: italic;">&lt;int&gt;</span> 2000<span style="color: #949494;">, </span>2000<span style="color: #949494;">, </span>2000</span></span>
<span><span class="co">#&gt; $ matrix.name <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> "U"<span style="color: #949494;">, </span>"V"<span style="color: #949494;">