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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.
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It is not possible to handle this at a kata level. See the answer you received from Chrono79 there: https://www.codewars.com/kata/577bd026df78c19bca0002c0/discuss#624d073dc0da4c00174b3922
BTW, there is another method that can do easily the same job.
It requires Node 15 which isn't available in CW yet.