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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.
nice, one way to avoid use an re library
It is okey. It could be better if you adapt the complexity to complexity of problem. Maybe is useful a dictionary approach for example if it is needed to know how many repeated letter were founded.