Corrected entry: When Tintin picks up Barnaby's newspaper, he looks at the letters and instantly knows what the letters mean, despite there being over 74 anagrams for the letters. There is no mark visible on the paper to show him the order, just the prints.
Correction: Take a close look, you can see that the letters are already in the right order. He just writes them out to make it clearer.
Friso94