Added in combinator reduction axioms for B' C' and S'. Also split the original reduction axioms into separate files: I+K, B+C, S, B'+C', S'.
%ID: $Id$
%Author: Jia Meng, NICTA
%untyped combinator reduction for S
clause(
forall([P, Q, R],
or( equal(hAPP(hAPP(hAPP(c_COMBS,P),Q),R),hAPP(hAPP(P,R),hAPP(Q,R))))),
a2 ).