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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 is not the best one.
render_str reassigned in each's iteration, @template can be considered a constant of string in this case, this is only my coding style.