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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.
Extremely unefficient solution with so many nested loops and totally unnecessary toList conversion.
Also, to me it doesn't look like so expressive.
Last but not least, there is no input validation at all.
Far away to be considered as 'Best practice'.