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Compute the output of the following program: Parent(dad_tough_guy,

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Compute the output of the following program:

Parent(dad_tough_guy, babe_ruth).

Parent(dad_tough guy, little_kid).

Parent(john_oldman, dad_tough_guy).

Parent(mary_oldwoman, dad_tough_guy).

Grandparent(X, Y) :- parent(X, Z), parent(Z, Y).

What is the following following Prolog query trying to ask? What are the values of X?

?- Grandparent(X, babe_ruth).
Customer: replied 3 years ago.
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