;">&lt;int&gt;</span>  <span style="color: #949494; font-style: italic;">&lt;int&gt;</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;">1</span> a     a         1     1     0      0     1     0      0</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;">2</span> b     <span style="color: #BB0000;">NA</span>        2     0     1      0     0     0      1</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span s