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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.
think about two pointers
Read this: https://www.codewars.com/kata/51ba717bb08c1cd60f00002f/discuss#60d725f657c9d5000d89e45a see if it helps.