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