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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.
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Hmmm. This feels more like 4 kyu. When comparing them to others this has been by far the most time consuming and also codewise the longest (although my solution could have been made shorter).
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I think you had the same idea as I did. This is the first solution that does not use the BigInteger. nice!