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- Python
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- Ruby
- Haskell
- Java
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- C#
- Elixir
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- OCaml (Beta)
- Crystal
- PHP
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- C++
- Scala
- Kotlin
- C
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- Reason (Beta)
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- Clojure
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- Factor (Beta)
- Groovy
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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.