PT75's not been released (perhaps I should say "published") yet. Just checked Amazon and Cambridge ... Nope! No PT75 anywhere yet. I pre-ordered it from LSAC and it's not here (not been shipped to my knowledge).
@jac376 said:
Flaw: The correlation of Ra, C, and (C --> Rh) does not mean there is a causation from C to Ra. The answer which strengthens this argument will show that (Rh --> Ra) (C causes Ra because it causes Rh which causes Ra) or directly ...