On a pad that morning, Geithner started writing out various merger permutations: Morgan Stanley and Citigroup. Morgan Stanley and JP Morgan Chase. Morgan Stanley and Mitsubishi. Morgan Stanley and CIC. Morgan Stanley and Outside Investor. Goldman Sachs and Citigroup. Goldman Sachs and Wachovia. Goldman Sachs and Outside Investor. Fortress Goldman. Fortress Morgan Stanley. It was the ultimate Wall Street chessboard.