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:- category(security,
	complements(bank)).

	% only authorize transfers up to 200 by patching the
	% "bank" object definition of the transfer/3 predicate
	transfer(From, To, Amount) :-
		(	Amount =< 200 ->
			% call original predicate definition
			@transfer(From, To, Amount)
		;	% print warning and make transfer fail
			write('Maximum transfer amount (200) exceeded!'), nl,
			fail
		).

:- end_category.
