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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.
I know that there is a kata where you have to take a list with nested lists inside and flatten them.
But, I have not seen a kata like this.
This is literally the same thing as the 7 kyu kata called "Fibonacci"
https://www.codewars.com/kata/57a1d5ef7cb1f3db590002af