MAYBE

Proof:
ConCon could not decide if this system is quasi-decreasing.
\cite{O02}, p. 214, Proposition 7.2.50 does not apply.
System R transformed to U(R).
Call external tool:
ttt2 - trs 30
Input:
  lt(x, 0) -> false
  lt(0, s(y)) -> true
  lt(s(x), s(y)) -> lt(x, y)
  ?1(true, x, y, ys) -> cons(y, cons(x, ys))
  cons(x, cons(y, ys)) -> ?1(lt(x, y), x, y, ys)

The external tool could not decide termination.