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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.
Wow !
What a solution!
Right! There is no limit for perfection.
Great one! you can replace the "map" by "flat_map" so that you can remove the "flatten" function by the way
There is no need to put a return here. Great one liner by the way !