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- JavaScript
- Python
- C#
- TypeScript
- Java
- CoffeeScript
- Crystal
- Ruby
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- Factor (Beta)
- Scala
- Lua
- Groovy
- Haskell
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- C++
- PHP
- Swift
- Elixir
- R (Beta)
- Shell
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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.