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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.
Duplicate: https://www.codewars.com/kata/545cedaa9943f7fe7b000048
Thanks for a fun kata. I suggest expanding the test cases since there are several half-correct solutions.
You could try a jumbling trick with LINQ: