[Mesorah] Shalsheles; 21 books

[Noah Witty]

I know the 4  in chumash. Perhaps RDG could cite the other three.

Which are the three books left out when there is a reference to 21 
sefarim in some of the texts on the blog RMP was kind enough to refer us to?

Noach Witty

P.S. I'm not sure which address to use.
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