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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.
@Duysenbinov: I don't know if it's your actual question, but the solutions must be submitted in the Solutions page from the code trainer, and that's enough.
You can ask in the discord group if you have a question. But what is the point in posting the solution here?
Please, don't post solutions in Discourse.