What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_3, x_3 is a cashier if and only if x_3 is a taxi driver. For all x_3, if x_3 were a sailor, then x_3 is a cashier.
For all x_3, if x_3 were a cashier, then x_3 is a taxi driver. For all x_3, if x_3 were a taxi driver, then x_3 is a cashier.