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https://boris-marinov.github.io/category-theory-illustrated/
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https://medium.com/sadasant/sections-and-retractions-a1a30601c000
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https://blog.juliosong.com/linguistics/mathematics/category-theory-notes-1/
- https://dkalemis.wordpress.com/2013/11/23/the-correspondence-between-monads-in-category-theory-and-monads-in-haskell/ How the category theory shows up in Haskell