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- JavaScript
- Python
- Ruby
- Crystal
- C++
- C#
- Swift
- Java
- Rust
- CoffeeScript
- Prolog (Beta)
- Scala
- PHP
- R (Beta)
- Elixir
- Haskell
- Groovy
- C
- TypeScript
- Julia (Beta)
- CFML (Beta)
- NASM
- COBOL (Beta)
- SQL
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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.