MAYBE
MAYBE
TRS:
 {
  U12(tt(), M, N) -> s(plus(activate(N), activate(M))),
      activate(X) -> X,
  U11(tt(), M, N) -> U12(tt(), activate(M), activate(N)),
    plus(N, s(M)) -> U11(tt(), M, N),
     plus(N, 0()) -> N
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
    U12(tt(), M, N) -> s(plus(activate(N), activate(M))),
        activate(X) -> X,
    U11(tt(), M, N) -> U12(tt(), activate(M), activate(N)),
      plus(N, s(M)) -> U11(tt(), M, N),
       plus(N, 0()) -> N
   }
  Fail