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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.
But we return square digit, and negative in square is a positive number. So I think it doesn`t matter
Could you please explain why is that?