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English Letter Frequency Counts:
Mayzner Revisited
or
ETAOIN SRHLDCU

> ...My distillation of the Google books data gives us 97,565 distinct words, which were mentioned 743,842,922,321 times (37 million times more than in Mayzner's 20,000-mention collection). Each distinct word is called a "type" and each mention is called a "token." To no surprise, the most common word is "the"....

-- Peter Norvig

http://norvig.com/mayzner.html