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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.
Instead of using C, he just made inline assembly functions (the thing to which C code would be compiled).
It is really just a flex, worst argument against it is that he makes assumptions about the architecture he is using (which for most of them, it's the same)