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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.
Impressive.
Thats a very illustrative example why some simple math can be extremly powerful.
Interesting. Using a map was also my first idea but I didn't know that I can just use an increment. I learned that not initialized ints become one after an increment.