Yep, I understand what happens after B has 2X, but I'm confused about how you can get to 2X in the first place. If you go ABCABB then it doesn't look like C gets 2X, it looks like B gets O instead.
How does a mate end up with 2X in the first place?
Also: are there chores where everyone is assigned? Like "pay your rent" where it's important that everyone does it?