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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.
plus, this is one of thouse questions that are solved best with a good amount of logic, not coding commads.
The author is not obliged to hint the users towards the solution, especially with such trivial tasks.