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- C++
- Objective-C (Beta)
- Crystal
- Ruby
- JavaScript
- Python
- C#
- C
- Java
- Haskell
- Julia (Beta)
- CoffeeScript
- PHP
- Dart
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- Swift
- Prolog (Beta)
- Clojure
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- COBOL (Beta)
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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.