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