---- CR(R cup S) ---- [Klein and Hirokawa, 2012] R: f(g(x)) -> h(g(x),g(x)) f(s(x)) -> h(s(x),s(x)) g(x) -> s(x) S: CP_S(R): f(s(___y145)) -> h(g(___y145),g(___y145)) CR(S): see below. ---- CR(R) ---- [Hirokawa and Middeldorp, 2011] R: CPS'(R): CP(R):