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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.
I think you misread the description. It clearly states to round to the nearest 10 when the result is odd. Since anything to the power of 0 is 1 (which is odd), it is rounded down to 0.