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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.
FFS... Could you please STOP posting solution of the hard version of the series in the easier ones...? x/
By doing this,you're litteraly spoiling the hard version.
The code is super short, but honestly I have no idea what's happening there.