(VAR x y z)
(RULES
h(z,e(x)) -> h(c(z),d(z,x))
d(z,g(0,0)) -> e(0)
d(z,g(x,y)) -> g(e(x),d(z,y))
d(c(z),g(g(x,y),0)) -> g(d(c(z),g(x,y)),d(z,g(x,y)))
g(e(x),e(y)) -> e(g(x,y))
)
(COMMENT Example 33 in \cite{D33})