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