What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: U(y) <-> S_2(y). forall y: ~U(y). forall y: S_2(y) <-> Q_4(y). forall y: T(y) <-> Q_4(y).
forall y: S_2(y) -> Q_4(y). forall y: T(y) -> Q_4(y). exists y: U(y) -> S_2(y). forall y: Q_4(y) -> S_2(y). forall y: Q_4(y) -> T(y). exists y: S_2(y) -> U(y). exists y: ~S_2(y).