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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.
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This is a super enjoyable solution. Conceptually, it bugs me that we're keeping track of change amount and 100-notes, since this should be redundant information. Nevertheless, I see that doing so allows you to make an elegant solution like this, much more elegant than mine indeed. Very nice.