(VAR V1 V2 N M X X1 X2) (RULES U11(tt,V1,V2) -> U12(isNat(activate(V1)),activate(V2)) U12(tt,V2) -> U13(isNat(activate(V2))) U13(tt) -> tt U21(tt,V1) -> U22(isNat(activate(V1))) U22(tt) -> tt U31(tt,N) -> activate(N) U41(tt,M,N) -> s(plus(activate(N),activate(M))) and(tt,X) -> activate(X) isNat(n__0) -> tt isNat(n__plus(V1,V2)) -> U11(and(isNatKind(activate(V1)),n__isNatKind(activate(V2))),activate(V1),activate(V2)) isNat(n__s(V1)) -> U21(isNatKind(activate(V1)),activate(V1)) isNatKind(n__0) -> tt isNatKind(n__plus(V1,V2)) -> and(isNatKind(activate(V1)),n__isNatKind(activate(V2))) isNatKind(n__s(V1)) -> isNatKind(activate(V1)) plus(N,0) -> U31(and(isNat(N),n__isNatKind(N)),N) plus(N,s(M)) -> U41(and(and(isNat(M),n__isNatKind(M)),n__and(n__isNat(N),n__isNatKind(N))),M,N) 0 -> n__0 plus(X1,X2) -> n__plus(X1,X2) isNatKind(X) -> n__isNatKind(X) s(X) -> n__s(X) and(X1,X2) -> n__and(X1,X2) isNat(X) -> n__isNat(X) activate(n__0) -> 0 activate(n__plus(X1,X2)) -> plus(activate(X1),activate(X2)) activate(n__isNatKind(X)) -> isNatKind(X) activate(n__s(X)) -> s(activate(X)) activate(n__and(X1,X2)) -> and(activate(X1),X2) activate(n__isNat(X)) -> isNat(X) activate(X) -> X )