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<ul>
<li>There are <$count filter="[tag[Contact]"/> people in this wiki.</li>
<li>There are <$count filter="[tag[Meeting]links[]!tag[Contact]"/> non-contact tiddlers linked from meetings.</li>
<$set name="totalTiddlers" value={{{ [!is[system]count[]] }}}>
<li><$text text={{{ [tag[Contact]count[]divide<totalTiddlers>multiply[100]precision[3]] }}}/>% of all non-system tiddlers in the wiki are contacts.</li>
</$set>
</ul>As you can see, the percentage calculation cannot be replaced since count[] is not the final filter step.