 If Teapots contains nothing but three individuals that are numerical teapots in the actual world, 33(b) is true in Teapots. But then none of the proper subsituations of Teapots can contain three individuals that are numerical teapots in the actual world. Any such situation contains at least one teapot that is a proper part of one of the teapots in Teapots, hence can no longer contain three numerical teapots.