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_2. q <-> p_8. p_8 <-> w_2.
q -> p_8 can be inferred via the biconditional elimination rule. p_8 -> w_2 can be inferred via the biconditional elimination rule. p_8 -> q can be inferred via the biconditional elimination rule. w_2 -> p_8 can be inferred via the biconditional elimination rule. ~p_8 can be inferred via the biconditional elimination rule.