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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.
Not kata-related.
If you look at the toop of the page you'll notice there's a language choice in solutions as well (and in the URL).
When you complete a challenge in a specific language, you unlock solutions in this language only.
You can see in which languages you solved a kata by searching it on your own "completed" page, or by trying the kata again and checking "Past solutions".