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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.
As noted by ARcard, it might be helpful to add to the problem description that the parameter 'functions' can't be altered by your function in any way, or the random tests fail. Otherwise, really nice kata!