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: p_9 -> w_3. p -> w_2. p_9 <-> w_2.
p_9 -> w_2 can be inferred via the biconditional elimination rule. w_2 -> p_9 can be inferred via the biconditional elimination rule.