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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 disagree with increasing the difficulty of this kata.
This is just a very simple kata with 2 possible values as input, for absolute beginners, and should stay as such.