urned.
	</dd>
	
	<dt><code><b>last</b>()</code></dt>
	<dd>
		Returns the last value of the set.
	</dd>
	
	<dt><code><b>popfront</b>()</code></dt>
	<dd>
		Removes the first value of the set and then returns it.
		If the set is empty this function has no effect.
	</dd>
	
	<dt><code><b>previous</b>(value [, start])</code></dt>
	<dd>
		Searches for the previous value of <code>value</code> starting from <code>start</code>.
		If <code>start</code> is not provided the search is done through the entire set.
		If <c