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. ~w_3. r_2 <-> t. r_2 -> w_3.
~r_2 can be inferred via the modus tollens rule. q and ~w_3 can be inferred via the conjunction rule. ~w_3 and q can be inferred via the conjunction rule. r_2 -> t can be inferred via the biconditional elimination rule. t -> r_2 can be inferred via the biconditional elimination rule.