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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.
Here is no sence to use CTE at all.
N has been known to be between 10 and 10000, so you do a lot of extra checks.