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 rich if and only if x_3 is a doctor. For all x_3, x_3 is rich.
For all x_3, if x_3 were rich, then x_3 is a doctor. For all x_3, if x_3 were a doctor, then x_3 is rich.