I know that as you progress through the game, high level raids are locked until you progress through the game more, and low level raids get locked in the same fashion, so at any given point there will always be some level raids that have 0% chance of occurring. But of the raid difficulty levels that are available to you at a given point, what are the odds of each occurring? Like if I had beaten the game and only 3-5 star raids were available, and I interacted with a den, what would be the odds of me getting a 3 star raid? Is there an equal chance of getting a 3, 4, or 5 star raid, or are some star levels more common than others?