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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.
In any language where you get overflow, you have to be able to handle it. This isn't a kata issue.
Please provide more clear instructions as to what tests will be run against the solution, especially BigInt.