====== Combinations with repeated ======
{{tag>combinatorics}}
===== Description =====
Program calculates combinations with repeated elements.

**Source**:  Guide to Prolog Programming (on-line tutorial)
===== Download =====
Program source code: {{combinations_with_repeated.pl}}
===== Listing =====
<code prolog>
comb_rep(0,_,[]).
comb_rep(N,[X|T],[X|RComb]):-N>0,N1 is N-1,comb_rep(N1,[X|T],RComb).
comb_rep(N,[_|T],RComb):-N>0,comb_rep(N,T,RComb).</code>
===== Comments =====