What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y_2: W(y_2) -> U(y_2). forall y_2: ~U(y_2). forall y_2: U(y_2) -> S(y_2). forall y_2: S(y_2) -> W(y_2).
exists y_2: ~W(y_2). forall y_2: U(y_2) -> W(y_2). exists y_2: W(y_2) -> S(y_2). exists y_2: S(y_2) -> U(y_2).