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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.
That's not a function, that's an assignment expression where the right hand side happens to be a function.
The kata is clear as mud in what exactly it wants us to do. The specification is severely lacking; limits, if any, are missing; there's a
puzzle
tag that means we might encounter anything, and author's rank estimate is3kyu
. Abandon all hope, ye who enter here. Prepare for Armageddon. But then you only have to jump through a reasonably-sized hoop to solve it.