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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 didn't, spent way too much time on creating whole pyramid. When I run it on my local machine I even get OverflowException when trying to sum last row. Feeling pretty bad about myself seeing as it's only 7kyu...