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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.
Oh my, really is it that simple. It is like puzzle where answer is in the question :)
A different question, why substr is deprecated, seems like a good utility function?
You are a brute force