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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.
Isn't that just a function of how many 1 kyu Java kata there are? You get what, 128 points for a 1 and 2 kyu? The site isn't going to check what percentage of 1kyu kata you've completed.. if you want to get to 1kyu in JS, do 2s, 3s and 4s.