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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.
Maybe it's something personal, because I'm practicing for interviews where I won't have the help of Google. But it would be interesting to have the Haversine formula available in the question statement