What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: P_1(x_6). forall x_6: P_1(x_6) -> Q_1(x_6). forall x_6: P_6(x_6) or U(x_6). forall x_6: ~P_6(x_6).
forall x_6: Q_1(x_6). forall x_6: U(x_6).