YES(?,O(n^1))
TRS:
 {f f X -> c(),
    h X -> c(),
    c() -> d()}
 DUP: We consider a non-duplicating system.
  Trs:
   {f f X -> c(),
      h X -> c(),
      c() -> d()}
  Natural interpretation:
   Strict:
    {f f X -> c(),
       h X -> c(),
       c() -> d()}
   Weak:
    {}
   Interpretation class: stronglylinear
   [d] = + 0
   [c] = + 1
   [h](X0) = + 1*X0 + 2
   [f](X0) = + 1*X0 + 7
   
   Qed