(VAR X Y) (RULES p(0) -> 0 p(s(X)) -> X leq(0,Y) -> true leq(s(X),0) -> false leq(s(X),s(Y)) -> leq(X,Y) if(true,X,Y) -> X if(false,X,Y) -> Y diff(X,Y) -> if(leq(X,Y),0,s(diff(p(X),Y))) )
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