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:
  ?2(c(y), x) -> k(y)
  ?1(d, x) -> ?2(h(x), x)
  g(x) -> ?1(h(x), x)
  h(d) -> c(a)
  h(d) -> c(b)
  f(k(a), k(b), x) -> f(x, x, x)

The external tool could not decide termination.