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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.
This is the same thing that happened to me.
It refused to let me pass this. The last condition always failed. I even copied the 'best answers' and it still failed. I don't know how to report an issue, but there is certainly one here.