What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, if y were a lawyer, then y is rich. There is at least one y for which if y were a lawyer, then y is rich. For all y, if y were rich, then y is a lawyer.
For all y, y is a lawyer if and only if y is rich. For all y, y is rich if and only if y is a lawyer. There is at least one y for which y is a lawyer if and only if y is rich. There is at least one y for which y is rich if and only if y is a lawyer.