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- Ruby
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- Haskell
- Python
- Java
- CoffeeScript
- C#
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- C++
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- TypeScript
- Swift
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- R (Beta)
- Objective-C (Beta)
- OCaml (Beta)
- Elixir
- Lua
- Julia (Beta)
- Scala
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- Go
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- Dart
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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.