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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.
Does not appear to be a kata issue, the warrior should be level 3 before that fight rather than level 4.
At least that's the case with both the kata reference and top rated solutions.