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: exists x_4: Q_4(x_4) -> R_4(x_4). forall x_4: P_2(x_4) or P(x_4). forall x_4: Q(x_4) -> Q_4(x_4). forall x_4: ~P_2(x_4) or Q(x_4). forall x_4: P(x_4) -> R_4(x_4).
exists x_4: Q(x_4) -> R_4(x_4) can be inferred via the existential transitivity rule. forall x_4: P(x_4) or Q(x_4) can be inferred via the universal resolution rule.