What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_11: P_9(x_11) <-> P_11(x_11). forall x_11: Q_11(x_11). forall x_11: P_11(x_11) -> ~Q_11(x_11). q_1 -> P_9(b_4).
forall x_11: ~P_11(x_11). forall x_11: P_9(x_11) -> P_11(x_11). forall x_11: P_11(x_11) -> P_9(x_11).