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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.
What do you mean, this kata is extremely good to learn things like optimizing your code...
This was a really interesting kata. Could have been solved a lot of different ways too. Nice one!
Definetly isn't...
I agree, maybe if it was a 4kyu problem, it would be fine.