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: ~t_4 <-> w. ~p_3. p_3 <-> t_4.
~t_4 -> w can be inferred via the biconditional elimination rule. p_3 -> t_4 can be inferred via the biconditional elimination rule. w -> ~t_4 can be inferred via the biconditional elimination rule. t_4 -> p_3 can be inferred via the biconditional elimination rule. ~t_4 can be inferred via the biconditional elimination rule.