mantic, for example, <code><a href="add.html">add()</a></code> and <code><a href="add.html">ref_add()</a></code>.</p>
<ul><li><p><code>setnew(...)</code> initializes and returns a <code><a href="Set.html">Set()</a></code> object.</p></li>
</ul><ul><li><p><code>as.set(x)</code> coerces <code>x</code> to a set.</p></li>
</ul><ul><li><p><code>as.orderedset(x)</code> coerces <code>x</code> to an ordered set.</p></li>
</ul><ul><li><p><code>is.set(x)</code> returns <code>TRUE</code> if <code>x</code> is of class 