lass='st'>"death"</span>, <span class='st'>"AC"</span>, <span class='st'>"BC"</span>, <span class='st'>"death"</span><span class='op'>)</span>,
                 DSTERM <span class='op'>=</span> <span class='va'>letters</span><span class='op'>[</span><span class='fl'>1</span><span class='op'>:</span><span class='fl'>6</span><span class='op'>]</span>,
                 stringsAsFactors <span class='op'>=</span> <span class='cn'>FALSE</span><span class='op'>)</span>

<span class='va'>QS</span> <span class='op'>