Write prolog query: closest_common_ancestor.   x is a closest common ancestor of two people y and z if x is an ancestor of both y and z and no child of x is an ancestor of y and z. (A closest common ancestor of two ?rst cousins will be someone who is a grandparent of both.)   first_cousin(C1,C2):- parent(P1,C1), parent(P2,C2), sibling(P1,P2). grand_parent(GP,GC):- parent(GP,P), parent(P,GC).

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