---- CR(R cup S)
---- [Klein and Hirokawa, 2012]
R:
F(G(x,A(),B())) -> x
G(F(H(C(),D())),x,y) -> H(K1(x),K2(y))
K1(A()) -> C()
K2(B()) -> D()
S:

CP_S(R):
F(H(K1(A()),K2(B()))) -> F(H(C(),D()))
CR(S):
see below.

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

CPS'(R):

CP(R):