Suppose that a Prolog database contains the following entries: eat(bear, fish) eat(fish, littlefish) eat(littlefish, algae) eat(raccoon, fish) eat(bear, raccoon) eat(bear, fox) eat(fox, rabbit) eat(rabbit, grass) eat(bear, deer) eat(deer, grass) eat(wildcat, deer) animal(bear) animal(fish) animal(littlefish) animal(raccoon) animal(fox) animal(rabbit) animal(deer) animal(wildcat) plant(grass) plant(algae) prey(X) <= eat(Y, X) and animal(X) Then the following dialog with Prolog could take place: ?animal(rabbit) yes ?eat(wildcat, grass) no ?eat(X, fish) bear гасcoon гасcoon ?eat(X, Y) and plant(Y) littlefish fox algae rabbit rabbit grass deer deer grass deer ?prey(X) Note that fish is listed twice as satisfying the last query because fish are eaten by bear (fact 1) and by raccoon (fact 3). Similarly, deer are eaten by both bear and wildcat. fish littlefish fish

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