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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.
The issue about random tests was still open, so, why opening another one? I had to replace the original solution once I've added random tests (but both solutions worked with the fixed test), so try again.