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- JavaScript
- Haskell
- Python
- Ruby
- Java
- F#
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- R (Beta)
- Scala
- Crystal
- C++
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- Julia (Beta)
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- COBOL (Beta)
- Lua
- Rust
- D (Beta)
- Go
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- CoffeeScript
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- Objective-C (Beta)
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- Kotlin
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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.