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 <-> s. ~p. p_17 <-> r.
~r and ~p can be inferred via the conjunction rule. ~p and ~r can be inferred via the conjunction rule. p -> s can be inferred via the biconditional elimination rule. p_17 -> r can be inferred via the biconditional elimination rule. s -> p can be inferred via the biconditional elimination rule. r -> p_17 can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule. ~p_17 can be inferred via the biconditional elimination rule.