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- Ruby
- Python
- JavaScript
- C#
- Crystal
- PHP
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- Java
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- Reason (Beta)
- VB (Beta)
- Go
- Racket
- CoffeeScript
- Dart
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- Julia (Beta)
- Elixir
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- COBOL (Beta)
- Lua
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- R (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.