(VAR x y)
(RULES
  f(x,g(x)) -> f(h(x),h(x))
  f(x,x) -> f(h(x),h(x))
  f(h(x),y) -> p(d(x),d(y))
  p(h(x),y) -> f(g(y),g(y))
  d(x) -> h(x)
  g(h(x)) -> h(x)
)
(COMMENT from the collection of \cite{ATU2014})