No one knows. If anyone knew, they’d say. And if they said, everyone would know. It wouldn’t be hard, it would be easy, if it was it. It wouldn’t be complicated. It would make sense. It would be easy, if anyone knew. But nobody knows. So stop thinking they do. At best it makes them feel screwed up. At worst it allows them to screw you. It’s ok to not know, since no one else does.