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_4 <-> t_2. ~p. t and s. w_4 <-> p.
t can be inferred via the simplification rule. s can be inferred via the simplification rule. w_4 -> t_2 can be inferred via the biconditional elimination rule. w_4 -> p can be inferred via the biconditional elimination rule. t_2 -> w_4 can be inferred via the biconditional elimination rule. p -> w_4 can be inferred via the biconditional elimination rule. ~w_4 can be inferred via the biconditional elimination rule.