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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.
感谢新思路！
ranks unchangable
I'd put it in 7kyu, as well - unless usage of sort() is explicitly prohibited.
Great kata, but I think this should be in 6kyu