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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.
I stumpled over this myself. No, you have to try to exchange the 100$ bill with a 50$ bill and a 25$ bill first and if that is False exchange the 100$ bill with 3 25$ bills. If you prorize in that order your code will work.
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