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. w. p_8 <-> s. s -> ~w.
~s can be inferred via the modus tollens rule. p and w can be inferred via the conjunction rule. w and p can be inferred via the conjunction rule. p_8 -> s can be inferred via the biconditional elimination rule. s -> p_8 can be inferred via the biconditional elimination rule.