What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_7: P_7(x_7) or U(x_7). exists x_7: ~P_7(x_7) or R_7(x_7). forall x_7: U(x_7) -> Q_1(x_7). forall x_7: ~Q_1(x_7).
forall x_7: ~U(x_7). exists x_7: U(x_7) or R_7(x_7).