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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.
Most of the simplist and top rated solutions here mostly make use of the System.Linq namespace. It's worth looking at one of these answers and understanding what they are doing as these reduce the complexity significantly