YES
O(n^3)
TRS:
 { +(0(), y) -> y,
  +(s(x), y) -> +(x, s(y)),
  +(s(x), y) -> s(+(x, y))}
 DUP: We consider a non-duplicating system.
  Trs:
   { +(0(), y) -> y,
    +(s(x), y) -> +(x, s(y)),
    +(s(x), y) -> s(+(x, y))}
  Matrix Interpretation:
   Interpretation class: triangular
       [X2]    [1 0 0][X2]   [0]
   [s]([X1]) = [0 1 0][X1] + [1]
       [X0]    [0 0 0][X0]   [0]
   
         [1]
   [0] = [0]
         [0]
   
       [X5]  [X2]    [1 1 0][X5]   [1 0 0][X2]   [0]
   [+]([X4], [X1]) = [0 1 0][X4] + [0 1 0][X1] + [0]
       [X3]  [X0]    [0 0 0][X3]   [0 0 1][X0]   [1]
   
   
   Qed