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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.
Please stop with variables like a1, p, x, p0...
It does not make sense, it's not readable and fosters bad practices for beginners.
I'm not sure that the translation to plain English bring a lot of value to this Kata. In my opinion, it pushes people to write horrors which would be unacceptable as production-like code.
Also agree with the comments, the little story with the wallpaper does not make any sense for real life applications.