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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.
Well it's at most 18 sorts with at most 19 elements so it is not that bad.
You are right. Here are benchmark results
This is incredibly slow, as Enumerable.Range needs to generate every number in every range you feed it.