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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.
I like the solution and I think it is the recursion algorithm if I am not wrong.
I spent time figuring out what the regexp does, but I was amazed by the solution.