What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Joseph is a politician if and only if it is raining. Richard is a police officer. If Joseph were a politician, then Karen is a sailor. If Karen were a sailor, then Richard is not a police officer.
Karen is not a sailor. If Joseph were a politician, then Richard is not a police officer. If Joseph were a politician, then it is raining. If it rains, then Joseph is a politician.