YES
O(n^4)
TRS:
 {
  minus(minus(x)) -> x,
      minus(h(x)) -> h(minus(x)),
   minus(f(x, y)) -> f(minus(y), minus(x))
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
    minus(minus(x)) -> x,
        minus(h(x)) -> h(minus(x)),
     minus(f(x, y)) -> f(minus(y), minus(x))
   }
  Matrix Interpretation:
   Interpretation class: triangular
       [X7]  [X3]    [1 0 0 0][X7]   [1 0 0 0][X3]   [0]
       [X6]  [X2]    [0 0 0 0][X6]   [0 0 0 0][X2]   [0]
   [f]([X5], [X1]) = [0 0 1 0][X5] + [0 0 1 0][X1] + [0]
       [X4]  [X0]    [0 0 0 1][X4]   [0 0 0 1][X0]   [1]
   
       [X3]    [1 0 0 0][X3]   [0]
       [X2]    [0 0 0 0][X2]   [0]
   [h]([X1]) = [0 0 1 1][X1] + [1]
       [X0]    [0 0 0 1][X0]   [1]
   
           [X3]    [1 0 1 1][X3]   [0]
           [X2]    [0 1 1 0][X2]   [0]
   [minus]([X1]) = [0 0 1 1][X1] + [1]
           [X0]    [0 0 0 1][X0]   [0]
   
   
   Qed