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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.
@Sennsei me neither
I don't see it as "great for many 8kyu ones"
you have to reconsider your algorithm. you're not correctly accounting for how you make change, and it might help visualize how you would do so, walking through a larger problem step by step.