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- JavaScript
- Python
- C#
- C++
- Haskell
- Java
- Ruby
- Clojure
- Elixir
- Rust
- PHP
- COBOL (Beta)
- C
- λ Calculus (Beta)
- Factor (Beta)
- Lua
- Groovy
- CoffeeScript
- TypeScript
- Swift
- Crystal
- R (Beta)
- Shell
- OCaml (Beta)
- Go
- Nim (Beta)
- Racket
- F#
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- D (Beta)
- Kotlin
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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.