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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.
For better legibility.
When returning change for 100, you have to use the biggest bills first, to not run out of the smallest.
You have change for the last guy if you return change the right way.