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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.
the instructions are very unclear, you say 20% off the total. but the actual calculation you used isnt even 20% off the total, this isnt how percentages work in math.