YES TRS: f(c(X,s(Y))) -> f(c(s(X),Y)) g(c(s(X),Y)) -> f(c(X,s(Y))) linear polynomial interpretations on N: f_A(x1) = 1 f#_A(x1) = x1 + 1 c_A(x1,x2) = x2 + 1 c#_A(x1,x2) = 1 s_A(x1) = x1 + 1 s#_A(x1) = 0 g_A(x1) = x1 g#_A(x1) = x1 + 3 precedence: g > s > f > c