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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.
"The returned value should be an array in the format [second oldest age, oldest age]."
The "numbers passed in" are the input. The input can be in any order, the output has requirements on the order.