What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_3, if y_3 were rich, then y_3 is a politician. For all y_3, if y_3 were a politician, then y_3 is rich. For all y_3, y_3 is rich if and only if y_3 is a politician.
For all y_3, y_3 is rich if and only if y_3 is a politician. For all y_3, y_3 is a politician if and only if y_3 is rich. For all y_3, if y_3 were rich, then y_3 is a politician. For all y_3, if y_3 were a politician, then y_3 is rich.