YES(?,O(n^1))
TRS:
 {f g X -> f X}
 DUP: We consider a non-duplicating system.
  Trs:
   {f g X -> f X}
  Natural interpretation:
   Strict:
    {f g X -> f X}
   Weak:
    {}
   Interpretation class: stronglylinear
   [g](X0) = + 1*X0 + 2
   [f](X0) = + 1*X0 + 0
   
   Qed