Undulating surface keeping edges straight

Thank you. I have to admit that being appreciated once in awhile is essential… :thinking:

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I prefer to ensure valid data at every step of the process instead of relying on other components to anticipate and deal with out of range data. Otherwise it’s too easy to end up with GIGO nonsense like this, where paper and manual methods saved the day:

In Penny Lane there is a fireman with an hourglass
And in his pocket is a portrait of the queen
He likes to keep his fire engine clean
It’s a clean machine

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Woah Joseph, I think you might have predicted the future by linking that article. Extremely relevant in today’s context (US presidential election) This is gold.