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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.
You should check what the value of num is first. In this case, if it's less than 0 (already negative) you simply return as is. If it's greater than or equal to 0, you return the negative of it.
LOL errors are crazy one :D
HILARIOUS