Good introduction to free theorems

I came across a good idea of free theorems in a functional language. However, the only resource I could find was Wadler’s article “Theorems for Free .” It's not bad, but it’s definitely not a textbook, and it’s hard for me to go through (I understood about half of this, and it took me quite a bit of time). Can you recommend me another article or tutorial aimed at a software developer familiar with functional programming, and not with the help of a scientific researcher of a functional language with a solid core?

Thank.

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functional-programming haskell
Sep 14
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