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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.
I also get the same error on the same test, and if I change the sample tests to the one above it checks out.
(EDIT) Our code is wrong - b.length can be shorter than a.length, so it stops by the first iteration