YES(?,O(n^2))
TRS:
 {
  not false() -> true(),
   not true() -> false(),
      odd 0() -> false(),
      odd s x -> not odd x,
    +(x, 0()) -> x,
    +(x, s y) -> s +(x, y),
    +(s x, y) -> s +(x, y)
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
    not false() -> true(),
     not true() -> false(),
        odd 0() -> false(),
        odd s x -> not odd x,
      +(x, 0()) -> x,
      +(x, s y) -> s +(x, y),
      +(s x, y) -> s +(x, y)
   }
  Matrix Interpretation:
   Interpretation class: triangular
       [X3]  [X1]    [1 1][X3]   [1 3][X1]   [0]
   [+]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [0]
   
       [X1]    [1 0][X1]   [2]
   [s]([X0]) = [0 1][X0] + [2]
   
         [0]
   [0] = [2]
   
         [X1]    [1 2][X1]   [3]
   [odd]([X0]) = [0 1][X0] + [2]
   
            [2]
   [true] = [0]
   
         [X1]    [1 0][X1]   [2]
   [not]([X0]) = [0 0][X0] + [0]
   
             [2]
   [false] = [0]
   
   
   Qed