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- JavaScript
- C#
- Java
- Haskell
- Python
- Ruby
- Rust
- C
- Crystal
- COBOL (Beta)
- Go
- D (Beta)
- Scala
- PHP
- OCaml (Beta)
- λ Calculus (Beta)
- CoffeeScript
- Swift
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- R (Beta)
- Julia (Beta)
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- Racket
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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.