YES
O(n)
TRS:
 {app(app(apply(), f), x) -> app(f, x)}
 Natural interpretation:
  Strict:
   {app(app(apply(), f), x) -> app(f, x)}
  Weak:
   {}
  Interpretation class: stronglylinear
  [apply] = + 1
  [app](X1, X0) = + 1*X0 + 1*X1 + 0
  
  Qed