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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.
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I had the same thing happen to me, it took about three iterations of the "Attempt" button to finally let me pass.
I didn't think that it could be because of the special characters, but I guess it's the only thing that makes sense.