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. ~p_8 <-> q_3. p_8 -> ~w.
~p_8 can be inferred via the modus tollens rule. ~p_8 -> q_3 can be inferred via the biconditional elimination rule. q_3 -> ~p_8 can be inferred via the biconditional elimination rule.