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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.
When you perform the & binary operation on 1, you get the least significant binary digit of the number. If that number is even, the digit will be zero, otherwise it will be one.