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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.
('dan', not 'kyu' ;p )
Marked as spoiler.
This is a very bad approach, actually. There are way better ways to handle this, without any dict. So providing this is just inviting other users to lazyness... ;p
Not a kata issue, it doesn't disallow any of those. Your code was wrong, read this