(VAR x)
(RULES
  p(x) -> q(x)
  p(x) -> r(x)
  q(x) -> s(p(x))
  r(x) -> s(p(x))
  s(x) -> f(p(x))
)
(COMMENT
[27] Example 3.3
submitted by: Takahito Aoto, Junichi Yoshida, and Yoshihito Toyama
)