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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.
Bitwise is a good way to go, though one thing to keep in mind with that solution is that it only works if x isn't 0 as 0 will falsly test as true.