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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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This is the best one !!
Great !! ... sort and reverse in one step, you are the master !! ;) :)
It's not more readable ... take a look at the next comment asking for what (-_) does ... but it is a cool and clever solution !! ;) :)