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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'd say this problem is 8 kyu, if you want this to be 7 kyu maybe add an extra dimension where instead of a long the user has to work with a string array and concatenate those values.