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- find_all_brothers(Z):- findall(X,brother(X,Z),X0),write(X0).
- brother(sam, bill).
- brother(bill, fred).
- find_all_brothers(Z) :-
- findall(X, (brother(X, Z) ; brother(Z, X)), X0), write(X0).
- find_all_brothers(Z) :-
- setof(X, (brother(X, Z) ; brother(Z, X)), X0), write(X0).
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