YES
O(n^2)
TRS:
 {f(s(s(x))) -> f(f(s(x))),
   f(s(0())) -> s(0()),
      f(0()) -> s(0())}
 Natural interpretation:
  Strict:
   {f(s(s(x))) -> f(f(s(x))),
     f(s(0())) -> s(0()),
        f(0()) -> s(0())}
  Weak:
   {}
  Interpretation class: deltarestricted
  [f](delta, X0) = + 0*X0 + 0 + 2*X0*delta + 1*delta
  [0](delta) = + 2 + 0*delta
  [s](delta, X0) = + 0*X0 + 0 + 1*X0*delta + 2*delta
  f_tau_1(delta) = delta/(0 + 2 * delta)
  
  s_tau_1(delta) = delta/(0 + 1 * delta)
  
  Qed