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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.
An "Unknown Error" is an error by the Codewars plattform. Submit your result, and reload the submission editor with a complete page refresh (depending on your OS/browser ctrl+shift+r, shift+F5 or another combination). HTH
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