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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.
Thanks, that's even more concise.
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I ran into this recently in the Python version. One of the random examples is 70799492 and 56991175. My code calculates 5 carries, the test case expects 4 carries.