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    We're not making arsenals here, we must write a program to do a task. Input validation has been done in many old katas and is now considered a bad practice for the reason I mentionned. Checking the input is a negative number is 8 kyu kata level. It's of course interesting to know how to do that, but mixing this with a totally independent task like finding multiples of a number doesn't bring any value, in real context it'd be better to handle input validation separately from the main algorithm.

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    Most languages already do. And better for those that don't, since it doesn't bring any value to the task.