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- Java
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- Python
- Ruby
- Haskell
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- Crystal
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- PHP
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- R (Beta)
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- Kotlin
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- Scala
- C++
- C
- CoffeeScript
- Rust
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- Prolog (Beta)
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- F#
- OCaml (Beta)
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- Elm (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.