YES(?,O(n^2))
TRS:
 {
     r1(empty(), a) -> a,
  r1(cons(x, k), a) -> r1(k, cons(x, a)),
             rev ls -> r1(ls, empty())
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
       r1(empty(), a) -> a,
    r1(cons(x, k), a) -> r1(k, cons(x, a)),
               rev ls -> r1(ls, empty())
   }
  Matrix Interpretation:
   Interpretation class: triangular
          [X3]  [X1]    [1 0][X3]   [1 0][X1]   [0]
   [cons]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [2]
   
         [X1]    [1 3][X1]   [2]
   [rev]([X0]) = [0 1][X0] + [0]
   
             [0]
   [empty] = [0]
   
        [X3]  [X1]    [1 3][X3]   [1 0][X1]   [1]
   [r1]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [0]
   
   
   Qed