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Name: Anonymous 2011-09-19 9:55

Yes.

Name: Anonymous 2011-09-20 18:35

>>15

parent(c,a).
parent(c,b).

sibling(A,B) :-
  A \== B,
  parent(C,A),
  parent(C,B).

?- sibling(a,a).
false.
What's the problem?
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