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: w_3. w_3 <-> q. forall x_9: P_9(x_9).
w_3 -> q can be inferred via the biconditional elimination rule. q -> w_3 can be inferred via the biconditional elimination rule.