Loading collection data...
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'd propose to add to the description that the return value needs to be an ordered list for each item.
Now you need to figure it out by reading the example or running a test.