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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 am having the same issue. One of the tests kept failing and I couldn't for the life of me figure out what was wrong. I copied the code to my machine to troubleshoot further and there I got the correct output (without changing the code).