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