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: q <-> q_8. p. ~q_8. p_12 -> ~p.
~p_12 can be inferred via the modus tollens rule. p and ~q_8 can be inferred via the conjunction rule. ~q_8 and p can be inferred via the conjunction rule. q -> q_8 can be inferred via the biconditional elimination rule. q_8 -> q can be inferred via the biconditional elimination rule. ~q can be inferred via the biconditional elimination rule.