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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.
It would be nice if a warrior had to complete at least one kata of the next kyu to actually pass to the next rank. A friend of mine got his 6th kyu by just completing 8 and 7 kyu katas.
Something tells me this might be copy-pasted from jsfromhell site