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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.
From the description it is unclear where to ceil in the calculation process. Because of that my solution did run randomly into errors because the results diverged by 1 here and there. It passed after I got "lucky" on an attempt iteration.