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: forall x_15: P(x_15) -> S_15(x_15). ~p_2. w -> p_2. S_15(a_15) -> w.
~w can be inferred via the modus tollens rule. S_15(a_15) -> p_2 can be inferred via the transitivity rule.