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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 didn't know the elegant maths for these series, so ended up doing a polynomial regression to solve summax/min. Sumsum was more straightforward.
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You are correct. This Kata needs revisions
Same problem in Firefox