What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: U(x_9) <-> S_9(x_9). U(e) -> q_6. ~q_6. q_6 -> U(e).
~U(e). forall x_9: U(x_9) -> S_9(x_9). forall x_9: S_9(x_9) -> U(x_9).