(CONDITIONTYPE ORIENTED)
(VAR x y)
(RULES
  a -> c
  a -> d
  b -> c
  b -> d
  s(c) -> t(k)
  s(c) -> t(l)
  g(x, x) -> h(x, x)
  f(x) -> pair(x, y) | s(x) == t(y)
)
(COMMENT
  \cite{G14}, example 22
  PhD Thesis, not yet published
)