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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.
Nice solution! However, your solution gives the bonus when the average is below 5, but that doesn't mean any one value wasn't above 5 (which means the bonus could be given when it shouldn't).