(CONDITIONTYPE ORIENTED)
(VAR x)
(RULES
  a -> c
  a -> d
  b -> c
  b -> d
  c -> e
  c -> l
  d -> m
  k -> l
  k -> m
  h(x, x) -> g(x, x, f(k))
  g(d, x, x) -> A
  A -> h(f(a), f(b))
  f(x) -> x | x == e
)
(COMMENT
  \cite{SG10}, example 3
  doi: 10.1016/j.jlap.2009.08.001
)