Set.insert(set, "first")
OrderedSet.insert(set, "insert")
OrderedSet.insert(set, "last")
OrderedSet.insert(set, "previous")
OrderedSet.insert(set, "sequence")
for word in OrderedSet.sequence(set) do
  io.write(word, " ")
end
		</pre>
	</li>
	
	<li>
		This class provides operations of some traditional data structures as aliases of its methods.
		<dl>
			<dt>Set operations</dt>
			<dd>
				<ul>
					<li><code><b>add</b>(value)</code> alias for <code>pushback(value)</code></li>
				</ul>
			</dd>
			<dt>Stack 