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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.
Glad you liked it. If theres a specific challange you want out there, you should try authoring something yourself :)
I spoiler it, this would made it a 8 kyu, and it is the key and simple thing to solve in this kata.