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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.
Excellent solution
clever solution
By far the best solution in terms of both clarity and performance (in my tests it's almost 10 times faster than the solution with list comprehension).