a rich man buys a old house. he founds a secure room with one door. there is a chimney in a corner, & a bookself. he selects it for his personal work room. he digital locked it and goes to work.he returns at night & finds a plastic box in the middle of the room. in the box a note written "samai ki ghari kabhi bhi ruk sakta hain".he checks the bookself and the whole rum but no hidden door. how?
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