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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.
C# test cases are way too hard to be 6 kyu Kata. Ruby's biggest test case is 999 while c#'s is 12345678. No idea about c# solution, and even if there is one it is definitely not 6 kyu.