What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: S_2(x_9) -> U(x_9). exists x_9: T(x_9) -> ~U(x_9). forall x_9: S_3(x_9) -> U(x_9). forall x_9: S_3(x_9) or S_2(x_9). forall x_9: U(x_9) -> S_3(x_9).
forall x_9: S_2(x_9) -> S_3(x_9). forall x_9: U(x_9). forall x_9: S_3(x_9) <-> U(x_9). forall x_9: U(x_9) <-> S_3(x_9).