What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: U(x_6) -> S(x_6). forall x_6: S(x_6) -> ~Q_6(x_6). forall x_6: Q_6(x_6). exists x_6: U(x_6) <-> W_1(x_6).
forall x_6: ~S(x_6). exists x_6: U(x_6) -> W_1(x_6). exists x_6: W_1(x_6) -> U(x_6).