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The reading ease algorithm we use is the Flesh-Kincaid algorithm, which works pretty well for regular prose books but clearly fails very badly on avant-garde prose like Ulysses or As I Lay Dying.
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Little Women is 0.07 more difficult than Ulysses.

https://standardebooks.org/ebooks/louisa-may-alcott/little-w...

The "very difficult" books are mostly political theory, including the famously challenging Communist Manifesto at 38.05.

https://standardebooks.org/ebooks/karl-marx_friedrich-engels...

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