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  1. Clock is a very a very important device. It is used by humans to know about the time.
  2. Without clock we cannot know what exact time is.
  3. A clock has three hands. One shows seconds, the other shows minutes and the third one shows hours. 
  4. The seconds hand if the fastest. And hours hand is the slowest.
  5. Some clocks also have pendulums which keep moving in to and fro motion.

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