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