What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_4, y_4 is rich if and only if y_4 will drink water. For all y_4, y_4 is rich.
For all y_4, if y_4 were rich, then y_4 is drinking water. For all y_4, if y_4 drinks water, then y_4 is rich.