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_4: P_2(x_4) or W_2(x_4). exists x_4: ~Q_4(x_4). forall x_4: W_2(x_4) -> Q_4(x_4). forall x_4: ~P_2(x_4) or S(x_4).
exists x_4: ~W_2(x_4) can be inferred via the existential modus tollens rule. forall x_4: W_2(x_4) or S(x_4) can be inferred via the universal resolution rule.