The Shorter Five Letter Word

What five letter word becomes shorter when we add two letters to it?

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The Girl and the Three Lamps

A girl is standing in a hallway with three lamp switches on the wall.

Each switch will turns on a different lamp inside a closed classroom. The girl canโ€™t see inside the classroom, and she cannot open the door except to enter the room. She is allowed to enter the room only once, and when she do, all the lamps must be turned off.

How will tell which switch turns on which lamp when she enter the classroom?

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