YES(?,O(n^1))
TRS:
 {f() -> g(),
  c() -> f()}
 DUP: We consider a non-duplicating system.
  Trs:
   {f() -> g(),
    c() -> f()}
  Natural interpretation:
   Strict:
    {f() -> g(),
     c() -> f()}
   Weak:
    {}
   Interpretation class: stronglylinear
   [c] = + 3
   [g] = + 0
   [f] = + 2
   
   Qed