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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.
I got a similar answer, but I think it is clear enough for everyone to understand. However, I'm not entirely sure about performance. I created two new methods, one for odd numbers and one for even numbers.
LOL :D