All employees must wear their uniforms at work., Obligation , Students may use the library during their free period., Permission , You must not use your phone during an exam., Prohibition, Drivers have to wear seatbelts at all times., Obligation , You cannot bring outside food into the restaurant., Prohibition , Visitors may not take photos inside the museum., Prohibition , You should apologize for being late., Obligation , You can leave early if you finish your work., Permission , Passengers must not smoke inside the airplane ., Prohibition , Students have to submit their assignments on time., Obligation .

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