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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 belive most sane c/c++ compilers optimize any multiplication/divison by powers of two into bit shifts, which is even faster than addition
Addition runs faster than multiplication