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> It's a bit like saying "if you have a paragraph in 'English' and it has no e's in it, it's probably not English."

For the exception, see

Wow, having read the example prose, it is quite an interesting sounding book.

https://en.wikipedia.org/wiki/Ella_Minnow_Pea is a riot of a read. Starts with a full complement of letters and drops one letter chapter by chapter.