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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.
this is the best solution
Well i will show someone this code if ask me what is a programming :D It's overkill for kata like this, maybe op wanted to practice OOP.
damn I did it same way, I submitted solution with edge relationship and then i saw this super easy solutions. I'm blind.