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_3 <-> w_2. r_1 or w_2. p_3 <-> r_1.
p_3 -> w_2 can be inferred via the biconditional elimination rule. p_3 -> r_1 can be inferred via the biconditional elimination rule. w_2 -> p_3 can be inferred via the biconditional elimination rule. r_1 -> p_3 can be inferred via the biconditional elimination rule.