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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 totally agree that the task is above the 8 kyu level. However, I have to say that it can be solved via coding (and very basic coding) rather than digging into docs.