What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Barbara sleeps, then it is raining. If it rains, then Jennifer is a writer. Jennifer is not a writer. It is overcast.
It is not raining. If Barbara sleeps, then Jennifer is a writer. Jennifer is not a writer and it is overcast. It is overcast and Jennifer is not a writer.