YES(?,O(n^1))
TRS:
 {app(app(apply(), f), x) -> app(f, x)}
 DUP: We consider a non-duplicating system.
  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] = + 3
   [app](X1, X0) = + 1*X0 + 1*X1 + 5
   
   Qed