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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.
Multiplication was probably invented the day after addition. This is not novel.
(Please don't make a Fibonacci kata next!)
From the Forum - Kata Best Practices - Make Sure Content is New :
Can we agree that adding two numbers is not really a novel concept?