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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.
Two corrections.
If the principal is already greater than or equal to the desired, the function SHOULD return 0. It's even mentioned in the instructions.
Second - this should be greater than or equal to, not just equal to