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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 think you did the same mistake as I have (as I got exactly the same failed test)
The problem was, that I was always looking for odd number in the list (which was super easy)
The real task is bit more complicated, so make sure you read the description carefuly.