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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.
this code has a problem, if the last digits are Int.MAX_VALUE, since adding one gets you in negative territory. And since there are no restriction in this regard in the task description, this code is a bit faulty, isn't it?