What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_9: P_9(x_9) <-> R_1(x_9). forall x_9: P_4(x_9) <-> P_9(x_9).
forall x_9: P_4(x_9) -> P_9(x_9). exists x_9: P_9(x_9) -> R_1(x_9). forall x_9: P_9(x_9) -> P_4(x_9). exists x_9: R_1(x_9) -> P_9(x_9).