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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.
It is not obsolete, it can be useful in some cases. This code was probably written a long time ago.
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Thanks!
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For real, I have no idea either
How it works?