YES TRS: f(s(x),y) -> f(x,s(x)) f(x,s(y)) -> f(y,x) f(c(x),y) -> f(x,s(x)) max/plus interpretations on N: f_A(x1,x2) = max{0, 2, 1} f#_A(x1,x2) = max{4, 5 + x1, 3 + x2} s_A(x1) = max{7, 4 + x1} s#_A(x1) = max{1, 2} c_A(x1) = max{1, 5 + x1} c#_A(x1) = max{0, 0} precedence: s > c > f