YES
O(n^3)
TRS:
 {    c() -> d(),
  f(f(X)) -> c(),
     h(X) -> c()}
 DUP: We consider a non-duplicating system.
  Trs:
   {    c() -> d(),
    f(f(X)) -> c(),
       h(X) -> c()}
  Matrix Interpretation:
   Interpretation class: triangular
       [X2]    [1 0 2][X2]   [3]
   [h]([X1]) = [0 0 2][X1] + [2]
       [X0]    [0 0 0][X0]   [0]
   
         [0]
   [d] = [0]
         [0]
   
       [X2]    [1 0 0][X2]   [1]
   [f]([X1]) = [0 0 3][X1] + [0]
       [X0]    [0 0 0][X0]   [3]
   
         [1]
   [c] = [2]
         [0]
   
   
   Qed