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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.
Did you bench it. It looks that hashset is not required or is slower that this solution. Probable because L3 cache
Isn't this solution potentially costly in performance ? (junior developer looking to do best here :) )
Where is the 48 coming from? I don't get the solution.