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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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(a&b) is a bitwise AND of the two numbers. The result is a number with each bit the result of an and of the two original bits. If you take 7 (0111) and 10 (1010), the result of the bitwise AND of those two numbers is 2 (0010).
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