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_2. t <-> q_2. w -> p_2. p_2 -> t.
w -> t can be inferred via the transitivity rule. t -> q_2 can be inferred via the biconditional elimination rule. q_2 -> t can be inferred via the biconditional elimination rule. ~t can be inferred via the biconditional elimination rule.