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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.
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Great Kata. Although I have had zero prior experience with Haskell, type families, datakinds, and GADTs -- whatever that may be -- I find this instructive, enjoyable, and somewhat challenging. This is a great introduction to the basics of mathematical logic. You need only to read between the lines, get the gist of what you're looking at, draw the picture in your head, and voila. Easy 2 kyu kata.
I'd highly suggest using just "while(n)" rather than"while(n!=0)" since every integers except 0 counts as 'true'.