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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.
One doc comment is enough to make it more than clear what's going on to anyone looking at your code if they know at least some LINQ (and that is a must for a C# dev).
This code is not clean, nightmare for maintenance work