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Relevent external libraries are not properly disabled: https://www.codewars.com/kata/reviews/5f396fcb92a0ec00016e4ceb/groups/5f3b2978dc2d32000115e43d
... plz think about those who don't have a math training => you should define what that means (or at least provide a link to the definition?)
Which specific libaries are forbidden? (and you should mention this in description) Because I am not sure whether my solution is allowed.
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