Right now this is [hardcoded](https://github.com/C7-Game/Prototype/blob/8b7643a1641ac43ca25ec0d6b1efc09df16c4d78/C7Engine/C7GameData/City.cs#L645) (and there are a bunch of places where we call the rank function with `2`). This could probably be moved to the [rules struct](https://github.com/C7-Game/Prototype/blob/8b7643a1641ac43ca25ec0d6b1efc09df16c4d78/C7Engine/C7GameData/Rules.cs#L2) so it can be loaded and modified in the JSON file with the other rules.