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srcnkcl

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Codewars can do this, they keep how problems was solved. If a problem was solved using some string by most answers than it is a good problem to learn that part of the language. With documentation you have really good way to cover all parts of a programming language.

Inverse square law works for light that goes every direction like sun or light bulbs, but many of these projects plan to send energy directionally like lasers or mirror based solutions so the dispersion of light is as minimum as it can get