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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.
It runs the same as n%2 because compilers turn it into a bit test, it only runs faster with optimizer turned off. I used it because once you're familiar with bit ops, it becomes a self-explanatory idiom.
clever use of bitshifting, probably runs very fast!