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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.
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Thanks. I must say I'm impressed that you manage to find this within codewars' time limit :)
And I'm happy you learned something thanks to this.
Very often problems that seem difficult have simple solutions.