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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.
There are also subtractions. In fact, there is one more addition than subtractions.
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Mathematically it makes no difference whether you include your points or not. Please see my comment here.
I think in this Kata you don't need to print strings in console. Just return it like a result of a function.