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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.
Totally agree, this is a clean and optimal solution. I did something similar without the nice use of functions.
I fail to see how the other warriors seemingly ignored the kata instructions regarding the 'at least 3 items' and 'very large array'.