And frankly, the answer is fairly self-evident. Every word has a vowel and there are only 5 (and a half) of them so it’s a gimme that the most used letter is going to be one.
Another easy insight is that articles are going to be among the most, if not the most, common words so “the” and “a” are top contenders. So without even looking it up you should have guessed “e” or “a.” And since “e” is a modifier—as in diphthongs and silent “e”—in so many words, “e” is a pretty obvious choice. And it is the right one. “A” is either second or top five depending on whether you’re after usage in text or usage in the lexicon.
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