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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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Yes sometimes using memory in the right way (when input data allow it) can greatly optimize a program like tables of sinus in ancient architechtures which hasn't got any mathematical processor.