(SIG
   (a   -> o)
   (f   o -> o)
   (h   o o -> o)
   (c   -> o)
   (b   -> o)
)
(RULES
   a -> f(f(h(a,c)))
   h(h(h(c,f(h(f(h(h(c,c),c)),b))),h(h(a,c),h(f(a),h(f(f(c)),h(c,b))))),h(f(a),c)) -> c
)