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 <-> p. w. t_3 -> ~w. t_3 <-> r.
~t_3 can be inferred via the modus tollens rule. r -> p can be inferred via the biconditional elimination rule. t_3 -> r can be inferred via the biconditional elimination rule. p -> r can be inferred via the biconditional elimination rule. r -> t_3 can be inferred via the biconditional elimination rule.