YES
O(n^2)
TRS:
 {a(a(x)) -> a(b(a(x)))}
 Natural interpretation:
  Strict:
   {a(a(x)) -> a(b(a(x)))}
  Weak:
   {}
  Interpretation class: deltarestricted
  [b](delta, X0) = + 0*X0 + 0 + 1*X0*delta + 0*delta
  [a](delta, X0) = + 0*X0 + 2 + 2*X0*delta + 0*delta
  b_tau_1(delta) = delta/(0 + 1 * delta)
  a_tau_1(delta) = delta/(0 + 2 * delta)
  
  Qed