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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.
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You could use the generator next to prevent compting all the values on your second line.
Also the lambda you define on line one is already defined as int.xor