/rdrr.io/r/base/colSums.html'>colSums</a></span><span class='op'>(</span><span class='va'>tmp</span><span class='op'>)</span> <span class='op'>&gt;</span> <span class='fl'>0</span><span class='op'>)</span> <span class='co'>## discard those not seen in the data</span>
<span class='op'>}</span>
</div></pre>
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