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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.
If your code fails on optimization, then it's most likely due to "expensiveness" of array and string methods. Try to use objects or maps. I won't go into more details as that would be spoiler teritory.