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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.
As far as I can tell, an incorrect solution will always say unsupported type. This makes debugging rather difficult and may cause some to unlock the solution just to see what the problem is.