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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.
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Nope, you've misread the instructions.
What about:
Sort the array on the basis of yymm, and break the ties by name.
(In any case, this is question)
Not an issue. There're typos in your solution (at least).