What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_15: P_15(x_15) or Q_11(x_15). forall x_15: Q_15(x_15). forall x_15: P_15(x_15) -> ~Q_15(x_15). p -> ~Q_11(b).
forall x_15: ~P_15(x_15).