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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.
So I only recently understood closures, actually only made sense after my attempts. Though, if I may ask, how does the lambda function relate to closures? I'm in python I should add.