YES(?,O(n^2))
TRS:
 {w r x -> r w x,
  b r x -> r b x,
  b w x -> w b x}
 DUP: We consider a non-duplicating system.
  Trs:
   {w r x -> r w x,
    b r x -> r b x,
    b w x -> w b x}
  Matrix Interpretation:
   Interpretation class: triangular
       [X1]    [1 3][X1]   [2]
   [b]([X0]) = [0 1][X0] + [1]
   
       [X1]    [1 1][X1]   [3]
   [w]([X0]) = [0 1][X0] + [1]
   
       [X1]    [1 0][X1]   [0]
   [r]([X0]) = [0 1][X0] + [2]
   
   
   Qed