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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.
it's the second one that's expected
that wording is terrible though because it refers to the assertion code which the solver doesn't get to see and it's all too easy to see "expected x" and then not read the rest