an><span class="co">#&gt; 1    &lt;NA&gt;           &lt;NA&gt;         &lt;NA&gt;  40     40   20     0         0     0</span></span>
<span><span class="co">#&gt; 2    &lt;NA&gt;           &lt;NA&gt;         &lt;NA&gt;  40     40   20     0         0     0</span></span>
<span><span class="co">#&gt; 3    &lt;NA&gt;           &lt;NA&gt;         &lt;NA&gt;  40     40   20     0         0     0</span></span>
<span><span class="co">#&gt; 4    &lt;NA&gt;           &lt;NA&gt;         &lt;NA&gt;  40     40   20    