YES TRS: 2nd(cons(X,n__cons(Y,Z))) -> activate(Y) from(X) -> cons(X,n__from(s(X))) cons(X1,X2) -> n__cons(X1,X2) from(X) -> n__from(X) activate(n__cons(X1,X2)) -> cons(X1,X2) activate(n__from(X)) -> from(X) activate(X) -> X max/plus interpretations on N: 2nd_A(x1) = max{4, x1} 2nd#_A(x1) = max{4, x1} cons_A(x1,x2) = max{6, 5 + x1, 5 + x2} cons#_A(x1,x2) = max{6, 5 + x1, 5 + x2} n__cons_A(x1,x2) = max{4, 4 + x1, 4 + x2} n__cons#_A(x1,x2) = max{4, 4 + x1, 4 + x2} activate_A(x1) = max{3, 7 + x1} activate#_A(x1) = max{3, 7 + x1} from_A(x1) = max{2, 6 + x1} from#_A(x1) = max{2, 6 + x1} n__from_A(x1) = max{1, x1} n__from#_A(x1) = max{1, x1} s_A(x1) = max{1, x1} s#_A(x1) = max{1, x1} precedence: activate = n__from = s > 2nd = from > cons > n__cons