r-pr">#&gt;</span>      a     b     c     d     x</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1 TRUE  TRUE  TRUE  TRUE  TRUE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2 TRUE FALSE FALSE FALSE FALSE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 3 TRUE  TRUE  TRUE  TRUE  TRUE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 4 TRUE FALSE FALSE FALSE FALSE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 5 TRUE FALSE FALSE FALSE FAL