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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.
why use the complex method to this kata? What does it means?
thinking about scalability from the first minute, i like it
I love the caching angle (with a cost for short numbers, though) but not sure gen_digits is an improvement over simple str() which returns an iterator out of the box.