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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.
my solution wasn't quite as elegant as this one, but I had some shared elements. I fiddled with some paper drawings of diamonds and counted spaces, asterisks, rows, etc. to help me identify patterns in the relationships between numbers.