What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 were happy, then x_5 is a cashier. For all x_5, x_5 is a police officer. For all x_5, if x_5 were a police officer, then x_5 is a cashier.
For all x_5, x_5 is a cashier.