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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.
Apparently the function has to be named 'square', which you only realize with the error message after attempting it. Very very poorly described Kata, in my opinion.
This is brilliant.