What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_18: P_3(x_18) -> P_18(x_18). forall x_18: P_4(x_18) -> P_3(x_18). forall x_18: P_18(x_18) -> P_3(x_18). exists x_18: ~P_9(x_18). forall x_18: P_9(x_18) or R(x_18). forall x_18: P_4(x_18) or P_18(x_18).
forall x_18: P_4(x_18) -> P_18(x_18). exists x_18: R(x_18). forall x_18: P_3(x_18). forall x_18: P_3(x_18) <-> P_18(x_18). forall x_18: P_18(x_18) <-> P_3(x_18).