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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.
Those two test cases are asking for the INDEX of the lowest value. It dosen't want to know what the lowest value IS, it just wants to know WHERE it is.