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