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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.
Nice!
When I was solving the problem, there was a comment filled with random integers in the Solution text box and nothing in Test Cases. I see that that's not the case anymore, so please ignore my comment.
What do you mean by "default code should be cleaned up"?
Default code should be cleaned up, default test suite should be fully prepared or remove altogether. Otherwise, it's ready to go.