What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, x is a police officer if and only if x is a lawyer. For all x, x is a lawyer or x is not a police officer.
For all x, if x were a police officer, then x is a lawyer. For all x, if x were a police officer, then x is a lawyer. For all x, if x were a lawyer, then x is a police officer.