 Yet even with (4.2) in play, it doesn’t follow that ‘anything goes’ with impossible worlds. No principle so far entails that some impossible world breaks the Adjunction rule, from \(A\) and \(B\) to \(A \wedge B\), simply because 4.2 doesn’t apply to inferences with multiple premises. (We discuss Adjunction-violating worlds further in  section 5.2  below.) To infer the ‘anything goes’ conclusion, that for any logically valid inference there is some impossible world that breaks it, we’ll need this principle: