====== Append ======
{{tag>lists}}
===== Description =====
Appending two lists

**Source**:  The Art of Prolog
===== Download =====
Program source code: {{append.pl}}
===== Listing =====
<code prolog>
/*
	append(Xs,Ys,XsYs) :-
		XsYs is the result of concatening the lists Xs and Ys.
*/

	append([],Ys,Ys).
	append([X|Xs],Ys,[X|Zs]) :- append(Xs,Ys,Zs).

%	Program 3.15: Appending two lists
</code>
===== Comments =====