What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: R(y) or ~Q(y). exists y: R(y) <-> Q_2(y). forall y: Q(y) or Q_2(y).
forall y: Q(y) -> R(y). exists y: R(y) -> Q_2(y). exists y: Q_2(y) -> R(y).