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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.
This isn't really a 7 Kyu (It's harder), it's an optimisation problem. So you have to think of a way to cut down on processing (amount of times you loop).
Your code being not fast enough is not a kata issue.