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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.
additional points for it working with non-integer values as well
Any explanation would be great. And it doesn't work for >= 4000
Can you explain what r in second argument does? I can't understand it looking at re.sub documentation