YES(?,O(n^1))
TRS:
 {-(-(neg x, neg x), -(neg y, neg y)) -> -(-(x, y), -(x, y))}
 DUP: We consider a non-duplicating system.
  Trs:
   {-(-(neg x, neg x), -(neg y, neg y)) -> -(-(x, y), -(x, y))}
  Natural interpretation:
   Strict:
    {-(-(neg x, neg x), -(neg y, neg y)) -> -(-(x, y), -(x, y))}
   Weak:
    {}
   Interpretation class: stronglylinear
   [neg](X0) = + 1*X0 + 4
   [-](X1, X0) = + 1*X0 + 1*X1 + 0
   
   Qed