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In order to understand a text, it is usually necessary to understand the spoken language associated with that text. In this way, writing systems are distinguished from many other symbolic communication systems.[38] Once established, writing systems on the whole change more slowly than their spoken counterparts, and often preserve features and expressions which are no longer current in the spoken language. The great benefit of writing systems is their ability to maintain a persistent record of information expressed in a language, which can be retrieved independently of the initial act of formulation.[38]

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