YES
O(n^2)
TRS:
 {f(f(x)) -> f(x),
   g(0()) -> g(f(0()))}
 Natural interpretation:
  Strict:
   {f(f(x)) -> f(x),
     g(0()) -> g(f(0()))}
  Weak:
   {}
  Interpretation class: deltarestricted
  [0](delta) = + 2 + 0*delta
  [g](delta, X0) = + 0*X0 + 0 + 3*X0*delta + 0*delta
  [f](delta, X0) = + 0*X0 + 0 + 1*X0*delta + 2*delta
  
  g_tau_1(delta) = delta/(0 + 3 * delta)
  f_tau_1(delta) = delta/(0 + 1 * delta)
  
  Qed