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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 not really a kata issue, since it's considered cheating.
This comment is hidden because it contains spoiler information about the solution
Thanks for reporting it, but use spoiler flag next time.
No spoilers but; that error is directed towards the line it's on. Re-read the instructions, because there's a case you're missing.
Thanks for the compliment, glad you enjoyed it :D