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: p <-> r_2. ~r_2. p_8 <-> p.
p -> r_2 can be inferred via the biconditional elimination rule. p_8 -> p can be inferred via the biconditional elimination rule. r_2 -> p can be inferred via the biconditional elimination rule. p -> p_8 can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.