What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 is not poor. For all x_9, x_9 is a police officer. For all x_9, x_9 is poor if and only if x_9 is a police officer.
Since the premises are contradictory, we can infer anything from them.