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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 really found this method to be interesting apporach to sole this kata , i was able to visualize that i can delete number if its found more than one in kata but not able conceptualize as code where and how :)