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 x_3 for which x_3 is a doctor or x_3 is not a cashier. For all x_3, if x_3 were a doctor, then x_3 is a cashier.
There is at least one x_3 for which if x_3 were a cashier, then x_3 is a doctor.