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Nowadays, the elevator has become an important part of people’s normal life. As we all know, this situation often happens that you can’t get in the elevator which you have waited for a while because there are too many people in it already, which would waste lots of time. That’s to say, if you know the amount of people in elevator in advance, you can turn to another way to go upstairs.
Elevator Prophet can provide waiters with the information about amount of people in elevator before the elevator come.
Jingchun Wang Ketuo Zhou Junnan Yu