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_13: Q_4(x_13) -> R_4(x_13). forall x_13: P_4(x_13) -> Q_4(x_13). forall x_13: P_13(x_13) -> R_4(x_13). exists x_13: P_13(x_13) and Q_13(x_13).
forall x_13: P_4(x_13) -> R_4(x_13) can be inferred via the universal transitivity rule. exists x_13: P_13(x_13) can be inferred via the existential simplification rule. exists x_13: Q_13(x_13) can be inferred via the existential simplification rule.