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