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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 don't think so. Before I saw this, I think that my solution is a Brute-force))))))
clean - yes, but unfortunately times out after 12 seconds
The regex itself is nothing fancy but the fact that he solved this problem with regex shows he's a very big fan of regex.