/span>
<span class='va'>pre</span> <span class='op'>&lt;-</span> <span class='st'>"test_"</span>

<span class='fu'>cd</span><span class='op'>(</span><span class='va'>base</span>, <span class='va'>pre</span>, <span class='fl'>1</span><span class='op'>)</span>
<span class='fu'>cd</span><span class='op'>(</span><span class='va'>base</span>, <span class='va'>pre</span>, <span class='fl'>2</span><span class='op'>)</span>
<span class='op'>}</span>
</div></pre>
  </div>
  <div class="col-md-3 hidden-xs hidden-sm" 