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Another riddle for you:
A man lives on the 20th floor of an apartment building. Every morning he leaves his apartment, get the elevator to the ground floor and goes to work.
Every evening he returns from work. He gets in the elevator on the ground floor, take the elevator to the 10th floor, gets out and climbs the stairs to his apartment UNLESS there are other people in the elevator or it is raining.
Why doesn't he take the elevator to the 20th floor every time?
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