What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? w -> s. ~s. ~S_11(a_11). forall x_11: U(x_11) <-> S_11(x_11).
~w. ~s and ~S_11(a_11). ~S_11(a_11) and ~s. forall x_11: U(x_11) -> S_11(x_11). forall x_11: S_11(x_11) -> U(x_11).