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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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The language versions can change at any moment with new updates, the description is not the place to note it (think there are tens of languages on CodeWars), to know which version is currently in use the right place is the trainer window.