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_1: Q_2(x_1) -> P(x_1). forall x_1: Q_3(x_1) -> Q_2(x_1). forall x_1: R(x_1) -> Q_3(x_1). exists x_1: P(x_1) -> R(x_1).
forall x_1: Q_3(x_1) -> P(x_1) can be inferred via the universal transitivity rule. forall x_1: R(x_1) -> Q_2(x_1) can be inferred via the universal transitivity rule. exists x_1: P(x_1) -> Q_3(x_1) can be inferred via the existential transitivity rule. exists x_1: Q_2(x_1) -> R(x_1) can be inferred via the existential transitivity rule.