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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.
Ye, 2 minutes after I asked I tried negative numbers and saw the problem hahah. I added some logic to check if it's already negative and now attempt is passed too
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To be fair the actual problem here is to understand that you only need to replace a T for an U.