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: r <-> t_2. p_8 <-> t_2. w_1. ~r.
w_1 and ~r can be inferred via the conjunction rule. ~r and w_1 can be inferred via the conjunction rule. r -> t_2 can be inferred via the biconditional elimination rule. p_8 -> t_2 can be inferred via the biconditional elimination rule. t_2 -> r can be inferred via the biconditional elimination rule. t_2 -> p_8 can be inferred via the biconditional elimination rule. ~t_2 can be inferred via the biconditional elimination rule.