What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Jessica were a politician, then it is sunny. William is not a scientist. If William were a scientist, then Karen is excited. If Karen were excited, then William is a scientist. If it is sunny, then Karen is excited.
Karen is not excited. If Jessica were a politician, then Karen is excited. If it is sunny, then William is a scientist. William is a scientist if and only if Karen is excited. Karen is excited if and only if William is a scientist.