It seems to be so easy to implement and everybody knows the problem: you take an elevator, you click the wrong floor and now you have to wait awkwardly on the wrong floor for the doors to close again.
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Elevators often have a max number of buttons you can push. If you push too many, they’ll all deselect. I used to work in an office building that was 7 or 8 stories but the max number of floors you could select on the elevator was 5. Every morning, people would get on the elevator and someone would inevitably push one too many buttons and everybody would sigh and say, “don’t push your button yet!”
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