The usual rules or is the simple cultural traits often seen in the daily life of a community or a collective. For example, there are racial used chopsticks; others use forks, knives; There are peoples of the users manual; Vietnamese people have the habit of eating at the sound, often to Europeans at eat, shut up, no squeaks. The same ethnic or community sometimes don't pay attention to the difference in the colloquial. Violation of this culture just makes other people uncomfortable, not any laws were punished.
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