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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.
I also did a similar solution but got error that BigInt is not available and did not know that I can import it in codewars. Then I went with a solution that is similar top voted so I guess I nailed it :)