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I'm confused. Elevator is going DOWN. Person wants to go UP. Presses UP button and elevator stops and lets someone off (not in response to a call). Person who wants to go UP doesn't notice it wasn't a call response and gets in elevator and notices it is going DOWN. Waits the entire DOWN cycle and then presses desired floor button. Elevator is now in UP mode.

What's the problem?

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The problem is that they unnecessarily increase the crowdedness, and make it more complicated for people to get out on the lower floors.

Also if there are multiple elevators, the one you actually called might stop unnecessarily.

Overall it's the same amount of stops regardless whether you take the right or the wrong one. But for some reason being in an elevator that stops without anyone getting in or out irks me.

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