><span class="fl">12</span><span class="op">:</span><span class="fl">20</span>,<span class="fl">1</span><span class="op">:</span><span class="fl">4</span><span class="op">]</span></span></code></pre></div>
<p>[1] 56</p>
<p>[1] 22</p>
<table style="width:72%;" class="table">
<colgroup>
<col width="12%">
<col width="13%">
<col width="15%">
<col width="15%">
<col width="15%">
</colgroup>
<thead><tr class="header">
<th align="center"> </th>
<th align="center">var_1</th>
<th align="center">var_2</th>
<th align=