ETAION SHRDLU

Also written as etaionshrdlu, ETAION SHRDLU is gibberish that first appeared with linotype machines and is twelve of the most commonly used English letters. These letters appeared on the first two rows of Linotype machines and were used if an error was made by running the fingers over each of the letters to complete the line, since it was often too difficult to erase the error at the time.