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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 agree Linq methods not always the best option for performance. :)
Nope :D Is is clever, but not best practice
Please, can you explain? You mean it is slow, or that it will not work? Or it will do something else than requested?