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_2 <-> p. ~r_2. p <-> t_2.
r_2 -> p can be inferred via the biconditional elimination rule. p -> t_2 can be inferred via the biconditional elimination rule. p -> r_2 can be inferred via the biconditional elimination rule. t_2 -> p can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.