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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.
Thnks - im already done it - im forget to use return
Failed asserting that null matches expected 15. - cant understand what the problem - code works in repl.it