YES
O(n^3)
TRS:
 {g(x, a(), b()) -> g(b(), b(), a())}
 DUP: We consider a non-duplicating system.
  Trs:
   {g(x, a(), b()) -> g(b(), b(), a())}
  Matrix Interpretation:
   Interpretation class: triangular
         [0]
   [a] = [1]
         [0]
   
         [0]
   [b] = [0]
         [0]
   
       [X8]  [X5]  [X2]    [1 0 0][X8]   [1 1 0][X5]   [1 0 0][X2]   [0]
   [g]([X7], [X4], [X1]) = [0 0 0][X7] + [0 0 0][X4] + [0 0 0][X1] + [0]
       [X6]  [X3]  [X0]    [0 0 0][X6]   [0 0 0][X3]   [0 0 0][X0]   [0]
   
   
   Qed