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_12. p_12 <-> r. q_2 -> r. p.
~p_12 and p can be inferred via the conjunction rule. p and ~p_12 can be inferred via the conjunction rule. p_12 -> r can be inferred via the biconditional elimination rule. r -> p_12 can be inferred via the biconditional elimination rule. ~r can be inferred via the biconditional elimination rule.