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- JavaScript
- F#
- C#
- Crystal
- Ruby
- CoffeeScript
- Python
- Haskell
- Swift
- Java
- C++
- Go
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- R (Beta)
- C
- Scala
- Rust
- Julia (Beta)
- Elixir
- Racket
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- PHP
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- Clojure
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- Groovy
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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.