YES
O(n)
TRS:
 {
           app(nil(), YS) -> YS,
         app(cons(X), YS) -> cons(X),
                  from(X) -> cons(X),
         zWadr(XS, nil()) -> nil(),
         zWadr(nil(), YS) -> nil(),
  zWadr(cons(X), cons(Y)) -> cons(app(Y, cons(X))),
                prefix(L) -> cons(nil())
 }
 Natural interpretation:
  Strict:
   {
             app(nil(), YS) -> YS,
           app(cons(X), YS) -> cons(X),
                    from(X) -> cons(X),
           zWadr(XS, nil()) -> nil(),
           zWadr(nil(), YS) -> nil(),
    zWadr(cons(X), cons(Y)) -> cons(app(Y, cons(X))),
                  prefix(L) -> cons(nil())
   }
  Weak:
   {}
  Interpretation class: stronglylinear
  [prefix](X0) = + 1*X0 + 1
  [zWadr](X1, X0) = + 1*X0 + 1*X1 + 3
  [from](X0) = + 1*X0 + 1
  [cons](X0) = + 1*X0 + 0
  [nil] = + 0
  [app](X1, X0) = + 1*X0 + 1*X1 + 2
  
  Qed