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- JavaScript
- Ruby
- C#
- Python
- CoffeeScript
- Crystal
- PHP
- Haskell
- Java
- Rust
- Julia (Beta)
- Kotlin
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- Swift
- Scala
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- Dart
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- Elixir
- Factor (Beta)
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- TypeScript
- Clojure
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- Groovy
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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.