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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.
Nope, that is the assertion messages, whereby the LHS array indicates your output whilst the RHS indicates the correct one (expected).
Not a kata issue though, your code does not comply to below