What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one y for which if y sleeps, then y is a police officer. For all y, y will sleep or y is not a police officer. For all y, if y were a police officer, then y is sleeping.
For all y, if y were a police officer, then y is sleeping. There is at least one y for which y will sleep if and only if y is a police officer. There is at least one y for which y is a police officer if and only if y will sleep.