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@ -31,6 +31,7 @@ Limits of recusrion schemes? Maybe a hylo can help to implement the list filter?
- [Promorphisms, Pre and Post](https://jtobin.io/promorphisms-pre-post) - Pratical examples of pre- and postpromorphisms by Jared Tobin.
- [Time Traveling Recursion Schemes](https://jtobin.io/time-traveling-recursion) - Exploring histo and futu by example by Jared Tobin.
- [Correcting the Visitor pattern](http://logji.blogspot.co.uk/2012/02/correcting-visitor-pattern.html) - Showing that the Visitor pattern implements an f-algebra for use with a catamorphism (in Java).
- https://stackoverflow.com/questions/36851766/histomorphisms-zygomorphisms-and-futumorphisms-specialised-to-lists
## Cheat Sheet