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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.
Your solution is too slow. This is a solution issue, not a kata issue.
seems like your solution is too slow and needs to be more efficient, if you post your solution below and mark it as a spoiler someone can help you :)