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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.
Beautiful! It was a very interesting read.
I think I ran into the same problem and what worked for me is to click on the attempt button multiple times until my solution got accepted. I don't know why what I wrote would produce different results at different time but maybe the server is producing the errors.