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: w -> w_3. w_3 <-> t. ~t.
w_3 -> t can be inferred via the biconditional elimination rule. t -> w_3 can be inferred via the biconditional elimination rule. ~w_3 can be inferred via the biconditional elimination rule.