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| USB post at laptop. (Photo taken at home)
There are many USB post on the laptop but we only use several of it which is it does not effect the function of the laptop if we are only used some of it.
Photo taken at CAIS UNIMAS
As example above, the water bottle cap opener can only be opened in one way only. The direction of it to move is fixed and also it have limitation to what extend it can be twisted until it is sealed tightly.
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