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- Python
- Haskell
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- C#
- Java
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- PHP
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- Julia (Beta)
- Prolog (Beta)
- Elixir
- C
- C++
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- Crystal
- CoffeeScript
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- Dart
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- BF (Beta)
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- Kotlin
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- Racket
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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.