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buttons in an elevator or stand too close to someone if there are few people.
*In a library, it is polite to have talk in the same noise volume as that of a classroom.
*In a cinema, it is correct to not talk during a movie because people are there to watch the film, also it is correct to not have phones on as the light and sound will distract other patrons.
*If you are going to be punctual, notify friends or acquaintances if you will be late.
*If you cannot show up to an outing, restaurant,

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