 all of <var class="var">oldcats</var>
are merged into it. <var class="var">newcat</var> must be an existing category in <var class="var">obj</var> if
<var class="var">obj</var> is ordinal.
</p>
<p>If <var class="var">newcat</var> is not provided, all of <var class="var">odcats</var> are merged into
<code class="code">oldcats{1}</code>.
</p>
</dd></dl>

</div>



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