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

CP_S(R):
F(I(___y123),___y125) -> G(H(I(___y123)))
CR(S):
see below.

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

CPS'(R):

CP(R):