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- Python
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- Ruby
- C#
- C
- Java
- Julia (Beta)
- Rust
- Go
- CoffeeScript
- Scala
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- PHP
- COBOL (Beta)
- Lua
- Crystal
- Haskell
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- λ Calculus (Beta)
- Clojure
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- Groovy
- NASM
- Factor (Beta)
- F#
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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.