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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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Not a kata issue! Likely you attempted it before and forgot to submit (click "ATTEMPT") or you forgot to reset the trainer. (I just resetted it and initial code is not passable)