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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.
Where can I find that 2 liner solution?
What helped me a lot was making graphs using the code from the easier version.
I was then able to see the patterns and get the answer by doing math.
Hope this helps you