YES TRS: f(s(x),y) -> f(x,s(s(x))) f(x,s(s(y))) -> f(y,x) max/plus interpretations on N: f_A(x1,x2) = max{0, 2 + x1, 1 + x2} f#_A(x1,x2) = max{0, 2 + x1, 1 + x2} s_A(x1) = max{4, 1 + x1} s#_A(x1) = max{4, 1 + x1} precedence: f > s