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 <-> t. ~t. t_4.
~t and t_4 can be inferred via the conjunction rule. t_4 and ~t can be inferred via the conjunction rule. p_12 -> t can be inferred via the biconditional elimination rule. t -> p_12 can be inferred via the biconditional elimination rule. ~p_12 can be inferred via the biconditional elimination rule.