YES
O(n)
TRS:
 {f(f(a())) -> f(g())}
 Natural interpretation:
  Strict:
   {f(f(a())) -> f(g())}
  Weak:
   {}
  Interpretation class: stronglylinear
  [a] = + 1
  [g] = + 0
  [f](X0) = + 1*X0 + 0
  
  Qed