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: ~q_17 -> w. w -> s. s -> r_6. p_17 <-> q_17. ~p_17.
~q_17 -> s can be inferred via the transitivity rule. w -> r_6 can be inferred via the transitivity rule. p_17 -> q_17 can be inferred via the biconditional elimination rule. q_17 -> p_17 can be inferred via the biconditional elimination rule. ~q_17 can be inferred via the biconditional elimination rule.