 Assume, with Ampliativity, that a subject S is justified in believing a proposition h on the basis of some evidence e without having independent justification for believing any other proposition p such that p together with e entails h. Notice that h obviously entails h or not-e. Therefore, by CP, S is justified in believing h or not-e. But, of course, e together with h or not-e entails h. Therefore, if S is justified in believing h on the basis of e, then there is a proposition which S is justified in believing and which together with e entails h.