What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all y_1, y_1 is a lawyer if and only if y_1 is poor. For all y_1, if y_1 were poor, then y_1 is a lawyer.
For all y_1, if y_1 were a lawyer, then y_1 is poor can be inferred via the universal biconditional elimination rule. For all y_1, if y_1 were poor, then y_1 is a lawyer can be inferred via the universal biconditional elimination rule.