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- C++
- Python
- Ruby
- JavaScript
- C#
- Haskell
- COBOL (Beta)
- Scala
- OCaml (Beta)
- C
- Crystal
- Java
- Clojure
- CoffeeScript
- PHP
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- TypeScript
- Rust
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- R (Beta)
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- Julia (Beta)
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- D (Beta)
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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.