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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 comment is hidden because it contains spoiler information about the solution
999needs to be padded up with zeros to have a total of 4 digits (the "length" of the original number), i.e.,999->9990.And so
9990-0999=>8991