 Hence, if a person S knows p on the basis of R, S is in a position to know q on the basis of R, where q follows from p. S is also in a position to know q on the basis of the conjunction of R together with the fact that p entails q. Thus if S knows p on some basis R, and believes q on the basis of R (on which p rests) together with the fact that p entails q, then S knows q. Again: if