Logic Programming and Prolog Exercise 4. Run the following Prolog program to answer ?-ancestor(X,Y):' father (terach , abraham). father (terach , nachor). father (abraham, isaac). mother (sara,isaac). parent (X, Y) parent (X, Y) ancestor (X,Y) 1 3 4 father (X, Y). :- mother(X,Y). :- ancestor(X,Y),parent(Y,X). :- parent (X , Y). 5 :- 6. ancestor(X,Y) Report the result and explain the reason for receiving it. Replace Line 7 with ancestor (X,Y) :- parent (X,Y), ancestor (Y,X). and re-run the program. Report the result and explain it if it is different from the first run.

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