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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.
Agreed
This is fun kata ) but definetly not the 5kyu...
I think Python just has a special function for it, most other languages probably require you to make an algorithm to figure it out.