text:  Yeah, regulators said Citi's latest living will was just not good enough, specifically having to do with data crunching to figure out its vulnerabilities in certain types of investments called derivatives. And the government said Citi just didn't have its act together on that front. You know, Citi's struggles are because its structure is really complicated. It's a combination of a number of businesses. It's shed some assets since the financial crisis, but its structure made it vulnerable then and continues to make it vulnerable now.