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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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The error you see happens before the check. The error is raised in line 2, and your check is too late, in line 3.
It's a bug in your solution, not a kata issue.
That's a problem with your code, not with the kata.