removing duplicates from result - newbee

From: Antony Sequeira (usemyfullname_at_hotmail.com)
Date: 03/14/04 

Date: Sun, 14 Mar 2004 22:07:37 +0000

I am learning prolog using the prolog book(1986) by Bratko.
I consult the following code

conc([],L,L).
conc([X|L1],L2,[X|L3]) :-
     conc(L1,L2,L3).

sublist(S,L) :-
     conc(_,L2,L),
     conc(S,_,L2).

I try
  sublist(X,[a,b]).
I get the following results.
?- sublist(X,[a,b]).

X = [] ;

X = [a] ;

X = [a, b] ;

X = [] ;

X = [b] ;

X = []

Is it expected behavior to get the same result (the empty list) more
than once?
Is this too early for me to be asking this question(my prolog knowledge
is limited to the first three chapters of Bratko)?
I am using SWI-Prolog version 5.2.11 on Windows 2000.

Thanks, 

-- 
Antony Sequeira
use my full name at hotmail.com

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