MAYBE

Proof:
ConCon could not decide confluence of the system.
\cite{ALS94}, Theorem 4.1 does not apply.
ConCon could not decide whether all critical pairs are joinable or not.
lte(x, y) = tt <= lte(s(x), y) = tt:
For all conditions c 'tcap(c.lhs)' is unifiable with c.rhs.