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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.
You can use expert level techniques here: https://www.codewars.com/kata/5588bd9f28dbb06f43000085
Not a kata suggestion. See https://docs.codewars.com/training/troubleshooting#post-discourse.