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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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You can't once it's been resolved or it has some answers. Don't worry about it.
Tests are fine, your code is returning wrong results, try with this test:
Not a kata issue. The error message is:
What tests and what values?