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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.
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I don't think its a 6kyu kata, as its very easy to get stuck. Unless you know the 'trick' to consider '4' and '9' numbers as roman number symbols as well. Yes, when you think of that, it becomes a simple implementation. But if you don't its very easy to go down a rabbit hole of counting repeats, borrowing, post processing, ...
Definitely. As long as you know where to start.
True, replacing
numswith[...nums]would fix it if that is needed3 years later - I got it, thank you for awesome answer )
formula from elementary school math textbook
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From their brain.