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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.
The test are ok, your code is wrong. You're showing there the expected result of one test and the input of the next one. The reasoning is also wrong, you're given bills, so you can't split them.