YES O(n^3) TRS: {f(s(X), Y) -> h(s(f(h(Y), X)))} DUP: We consider a non-duplicating system. Trs: {f(s(X), Y) -> h(s(f(h(Y), X)))} Matrix Interpretation: Interpretation class: triangular [X5] [X2] [1 0 1][X5] [1 0 0][X2] [0] [f]([X4], [X1]) = [0 0 0][X4] + [0 1 0][X1] + [1] [X3] [X0] [0 0 0][X3] [0 0 0][X0] [0] [X2] [1 0 0][X2] [0] [s]([X1]) = [0 0 0][X1] + [0] [X0] [0 0 0][X0] [1] [X2] [1 0 0][X2] [0] [h]([X1]) = [0 0 0][X1] + [0] [X0] [0 0 0][X0] [0] Qed