he removed value is returned or no value is returned if <code>value</code> is not found.
	</dd>
	
	<dt><code><b>replace</b>(old, new [, start])</code></dt>
	<dd>
		Searches for value <code>old</code> and replaces it by value <code>new</code> starting the search after the value of <code>start</code>.
		If <code>start</code> is not provided the search is done through the entire set.
		The replaced value is returned or no value is returned if <code>old</code> is not found or if <code>new</code> already belongs