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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.
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There are some edge cases that the random test would sometimes trip, but the regular test cases wouldn't. I was trying to debug exactly what it was with the console, but I can't see my console ouput...