Alphabet

h:[o → o] ⟶ o
g:[o × o] ⟶ o
f:[o × o] ⟶ o
b:o
a:o

Variables

x:o
F:o → o

Rules

f(x, b)⇒g(x, x)
g(x, a)⇒f(x, x)
h(F)⇒F · a
h(F)⇒F · b