Xiao Liu, Xiao Li, and Xiao Feng estimated after the CET-4: Xiao Liu said: "I'm definitely good" Xiao Li said: "I'm sure I passed" Xiao Feng said: "I can't be excellent" After I came down, I found that all three of them had guessed wrong, and failed, passed, and each of them was excellent. From this we can infer:. ['Xiao Liu failed, Xiao Li excellent, Feng Xiao passed.', 'Xiao Liu is excellent, Xiao Li is passing, Xiao Feng is failing.', 'Liu passed, Xiao Li failed, Feng Feng was outstanding.', 'Xiao Liu passed, Xiao Li excellent, Feng failed.']