(VAR X Y) (RULES ackin(0,X) -> ackout(s(X)) ackin(s(X),0) -> u11(ackin(X,s(0))) u11(ackout(X)) -> ackout(X) ackin(s(X), s(Y)) -> u21(ackin(s(X), Y), X) u21(ackout(X),Y) -> u22(ackin(Y,X)) u22(ackout(X)) -> ackout(X) )
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