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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.
The explanation is bad, also the difficulty is greatly underestimated, I solved 2 kata from this series and don't want to anymore, they are disgusting