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- Objective-C (Beta)
- PHP
- Java
- JavaScript
- Swift
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- TypeScript
- Python
- C++
- Haskell
- C#
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- Ruby
- Crystal
- C
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- Julia (Beta)
- Racket
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- Lua
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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.