What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: ~P_7(x_9). forall x_9: P_7(x_9) <-> P(x_9). forall x_9: ~P_9(x_9) or P(x_9). forall x_9: P_9(x_9). forall x_9: ~Q_9(x_9) or S(x_9).
forall x_9: P_7(x_9) -> P(x_9). forall x_9: P(x_9) -> P_7(x_9). forall x_9: ~P(x_9).