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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 like this because if it's devisible by 400 it means it must be divisible by 4 and 100 right?
Then it's a simple order of precedence to get the answer.
Cool!