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Consider the following Prolog program: parent_of(j...
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Consider the following Prolog program:
parent_of(john,mary).parent_of(john,peter).parent_of(susan,mary).ancestor_of(X,Y) :- parent_of(X,Y).ancestor_of(X,Y) :- parent_of(X,Z), ancestor_of(Z,Y). The query below produces exactly two answers.
?- ancestor_of(john,Y).100%
0%