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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.
I was stuck on my java solution to this kata for awhile. I solved it almost instantly today in python after not thinking about it for a few months.
I should have just returned the expression, but otherwise I'm happy with the solution, and also makes me feel like I'm a better programmer than I was a few months ago.