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When people eat in some restaurants,we need to take chopsticks by ourselves.There are one box that fills with chopsticks and we need to count how many chopsticks we need.It is too inconvenient to waste our time.The concept of PCB is that we can see how many pair of chopsticks in the box clearly and take them easily.In this way,we don’t need to count how many chopsticks we need.
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Taipei, Taiwan
Chia-Chun Chang,
Shih Chien University, Taipei