how to stop repititions in rules in prolog

Posted by Pradeep on Stack Overflow See other posts from Stack Overflow or by Pradeep
Published on 2010-03-17T05:10:26Z Indexed on 2010/03/17 5:11 UTC
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prolog

in my prolog rule

marriedcouple(X,Y) :- parent((X,Z),bornin()), parent((Y,Z),bornin()), female(X),male(Y); male(X),female(Y), different(X,Y).

when a parent have two kids. the couple shows two times. how to stop this

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how to stop repititions in rules in prolog

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