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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.
Mutating the list on the run time is a good idea?
I mean it is still a good try. Try to be a lazy thinker. The basic to programming is to be a 'lazy' thinker.