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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.
regarding the "sorting stuff", you would sort the arrary from biggest to smallest then you will think critically about how you will sum the difference of the numbers