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- Python
- JavaScript
- Ruby
- Haskell
- COBOL (Beta)
- λ Calculus (Beta)
- C
- Rust
- PureScript (Beta)
- Scala
- Java
- C#
- Clojure
- PHP
- Prolog (Beta)
- CoffeeScript
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Start training on this collection. Each time you skip or complete a kata you will be taken to the next kata in the series. Once you cycle through the items in the collection you will revert back to your normal training routine.