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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.
Man, I can't believe I missed that! Unfortunately too much time has passed and I'm no longer able to edit this kata :(
Indeed. The description should change or all test cases should be square matrices.