---- CR(R cup S)
---- [Klein and Hirokawa, 2012]
R:
F(c(x)) -> G(x)
G(x) -> F(x)
c(x) -> x
S:

CP_S(R):
F(___y120) -> G(___y120)
CR(S):
see below.

---- CR(R)
---- [Hirokawa and Middeldorp, 2011]
R:

CPS'(R):

CP(R):