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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.
Ah, I see what you mean. I think I've fixed that now?
Test.assertEqualsrequires the values to be exactly equal (===). My guess is you were returning"0"instead of0.according to instructions, you have to return only EMAILs, not problematic usernames