This is false: That there is an adept, A, and that this is false: That there is a stone of a kind, S, and this is false: That there is an adept, A', and that this is false: That A' could produce a stone of the kind S. (Where again it is neither asserted nor denied that A and A1 are identical, but the point is that this proposition holds even if they are not identical, thus distinguishing this from