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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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The question is why do the random test cases give you challenges like n=0.13393639344722033... is it intended to calculate roots like these ?
The description of the kata could've been better, but whether you disable Math.pow() in JS or not it's still tier 8 kata, so I don't expect much.