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- JavaScript
- C#
- Python
- Crystal
- Ruby
- TypeScript
- PHP
- Julia (Beta)
- Haskell
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- CoffeeScript
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- COBOL (Beta)
- Scala
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- C
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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.