What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_13: U(x_13) or ~Q_6(x_13). forall x_13: Q(x_13) -> Q_6(x_13). forall x_13: S(x_13) -> U(x_13). forall x_13: U(x_13) -> S(x_13).
forall x_13: Q_6(x_13) -> U(x_13). forall x_13: S(x_13) <-> U(x_13). forall x_13: U(x_13) <-> S(x_13).