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- JavaScript
- CoffeeScript
- Haskell
- Ruby
- Python
- Scala
- C++
- PHP
- Crystal
- Julia (Beta)
- C
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- R (Beta)
- Groovy
- Java
- COBOL (Beta)
- Go
- TypeScript
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- D (Beta)
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- Prolog (Beta)
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- Shell
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- Kotlin
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.