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- JavaScript
- CoffeeScript
- PHP
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- Haskell
- Ruby
- COBOL (Beta)
- C#
- Java
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- Elixir
- Go
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- TypeScript
- C++
- Crystal
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- Julia (Beta)
- R (Beta)
- Reason (Beta)
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- Objective-C (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.