YES(?,O(n^2))
TRS:
 {.(.(x, y), z) -> .(x, .(y, z))}
 DUP: We consider a non-duplicating system.
  Trs:
   {.(.(x, y), z) -> .(x, .(y, z))}
  Matrix Interpretation:
   Interpretation class: triangular
       [X3]  [X1]    [1 3][X3]   [1 0][X1]   [2]
   [.]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [2]
   
   
   Qed