What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: ~W_2(y). exists y: ~T(y) or T_3(y). forall y: W_2(y) -> S_1(y). forall y: S_1(y) -> W_2(y). forall y: T(y) or S_1(y).
forall y: ~S_1(y). exists y: S_1(y) or T_3(y). forall y: W_2(y) <-> S_1(y). forall y: S_1(y) <-> W_2(y).