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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 second this, or just freaking array would make more sense. The problem says to return a [x, y], I shouldn't have to poke through the test cases to figure it wants an vector with 2 entries.