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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'm having the same problem. Are we all doing something wrong is there something wrong with the problem?
Test cases don't require proper rounding. Not a major issue, but something to take into consideration.