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_1 for which if x_1 were fast, then x_1 is rich. For all x_1, x_1 is rich if and only if x_1 is fast.
For all x_1, if x_1 were rich, then x_1 is fast. For all x_1, if x_1 were fast, then x_1 is rich.