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- Python
- JavaScript
- Ruby
- Crystal
- Haskell
- Java
- C++
- Julia (Beta)
- COBOL (Beta)
- Prolog (Beta)
- CoffeeScript
- C#
- Rust
- R (Beta)
- Dart
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- C
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- Elixir
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- Factor (Beta)
- Go
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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.